# Denver freight accessorial charges to watch

> Denver lane and fuel cost data, read September 2026, and what it means for accessorial charges on freight invoices moving through the market.

Source: https://valuexpa.com/insights/denver-freight-accessorial-charges-to-watch
Publisher: ValueXPA (https://valuexpa.com)
Updated: 2026-09-07

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Margin drift is the gap between what a vendor contract says and what the invoice actually charges. A Denver-lane invoice carries the same drift risk as any freight invoice, but the inputs behind its surcharge lines are moving at a documented pace right now, and that pace changes what an audit should test first.

Denver sits at the edge of several long-haul lanes and inside a mountain fuel and elevation cost structure that shows up as accessorials, not base rate. This page names what is measurably different about that cost structure this quarter, and what the data does not tell you.

## Executive Summary

Truck transportation costs, measured by the Producer Price Index for truck transportation of freight (BLS series WPU3012), stood at 170.984 in July 2026, up 10.9% year over year, read September 6, 2026. Long-distance truckload trucking specifically (BLS series PCU484121484121) rose 8.1% year over year to an index of 195.575 over the same period. Gasoline, tracked in the PPI for fuels and related products and power (series WPU0571), rose 37.1% year over year to 302.759.

None of these three series is Denver-specific. No series in the proof registry breaks freight cost out by metro or by lane. What they establish is the direction and scale of the two inputs a Denver-lane fuel surcharge and accessorial schedule are built on: the underlying trucking cost base and the fuel cost that sets the surcharge trigger. A surcharge schedule negotiated before this year's increase is now measured against a stale reference point, wherever the freight moves.

What changes for a Denver shipper is not the surcharge formula. It is the size of the gap between what that formula should now produce and what a carrier invoice bills when the fuel index the surcharge references is not re-checked against the current PPI reading. Denver's own lane structure, mountain fuel stops and backhaul-scarce lanes out of the market, adds accessorial categories that a flatter regional lane does not carry at all.

## 1. What is different about freight billing in Denver?

**Denver freight billing differs in two structural ways: carriers price mountain-grade fuel consumption separately from flat-lane fuel, and backhaul capacity out of Denver is thinner than inbound capacity, which shows up as deadhead and repositioning accessorials rather than a higher base rate. Neither shows up if an invoice audit only checks the linehaul rate against the rate card; both live in accessorial lines that a rate-card-only review skips entirely.**

A truck climbing into or out of Denver on I-70 or I-25 through the foothills burns fuel at a different rate than the same truck on a flat interstate segment. Carriers account for this with a grade or mountain surcharge, billed as a separate line, not folded into the linehaul rate.

Denver also has a backhaul imbalance: more freight moves in than moves out on several regional lanes. A carrier that cannot find a return load prices that risk into a [deadhead or repositioning charge](/guides/duplicate-freight-billing-and-the-multi-carrier) on the outbound leg, whether or not the shipper's contract names that charge.

Both charges are legitimate cost recovery when the underlying event happened. The audit question is not whether the charge is real. It is whether the invoice actually documents the grade segment or the empty mile it is billing for, and whether the rate applied matches what the carrier's own tariff states for that accessorial.

## 2. How does the current fuel cost trend affect a Denver fuel surcharge?

**Gasoline prices, tracked in the PPI for fuels and related products and power (BLS series WPU0571), rose 37.1% year over year to an index of 302.759 in July 2026, read September 6, 2026. A fuel surcharge table keys its tier to a fuel price benchmark; when the underlying benchmark moves this much this fast, a surcharge schedule set even a few months earlier is testing invoices against a number the market has already passed.**

A fuel surcharge is a lookup: the carrier or 3PL states a benchmark fuel price, usually diesel, and a surcharge percentage that adjusts as that benchmark moves through defined bands. The mechanism works only if the benchmark used on the invoice is the current one.

The gasoline PPI figure above is not the diesel figure a Denver freight contract would typically reference, and the registry does not carry a diesel-specific reading for this market. What it does establish is that fuel costs generally have moved sharply within the year, which is exactly the condition under which a stale surcharge reference produces the widest gap between contract and invoice.

The audit step this supports is narrow and specific: pull the benchmark actually printed on the invoice, and confirm it is the current period's reading rather than a table left over from the last contract renewal.

## 3. What does the long-distance trucking cost trend mean for Denver's long-haul lanes?

**Long-distance truckload trucking costs, measured by BLS series PCU484121484121, rose 8.1% year over year to an index of 195.575 in July 2026, read September 6, 2026. Denver's freight base is disproportionately long-haul rather than short regional runs, so a cost trend measured at the long-distance truckload level applies more directly to a typical Denver outbound shipment than it would to a metro with mostly short-haul lanes.**

Denver is not adjacent to another major freight market at short-haul distance in most directions. Freight moving out of Denver toward the coasts, the Midwest, or the Gulf runs long-haul lane lengths more often than the short regional hops common near denser freight corridors.

That lane-length profile is why the long-distance truckload PPI series is the more relevant of the two trucking-cost series here, more relevant than the general truck transportation of freight series, even though neither is Denver-specific.

A rate card negotiated for Denver's long-haul lane mix should be tested against a trend built on the same lane length, not against a nearby short-haul benchmark that moves differently. The number itself does not tell a shipper what their own rate should be. It tells them the direction the underlying cost has moved since the rate was last set, which is the fact an audit needs before it can ask whether the current rate is still defensible.

## 4. Which accessorial categories should a Denver shipper check first?

**Four accessorial categories carry Denver-specific risk: mountain or grade surcharges, deadhead and repositioning charges tied to the backhaul imbalance, fuel surcharges keyed to a stale benchmark, and detention charges at facilities near the metro's limited dock capacity. Each is a legitimate charge type when documented correctly and a drift source when the invoice does not match the underlying event or the current tariff rate.**

- **Mountain or grade surcharge:** Billed for elevation-driven fuel consumption on specific route segments. Check that the segment billed actually includes the graded portion of the route.

- **Deadhead and repositioning:** Billed when a carrier cannot secure a return load out of the market. Check that an empty mile was actually driven and that the rate matches the carrier's own published accessorial rate.

- **Fuel surcharge benchmark:** Keyed to a published fuel index. Check the benchmark period printed on the invoice against the current reading, not a table carried over from the last renewal.

- **Detention at origin or destination:** Billed when a truck waits beyond a free time allowance at a dock. Check the arrival and departure timestamps against the contract's free-time terms before accepting the charge as billed.

## 5. Can this cost data tell you whether your own Denver freight rate is fair?

**No. The PPI series cited here measure national trucking and fuel cost trends, not a Denver-specific rate, and not your contract's actual terms. They establish direction and scale of cost movement, which tells you whether a rate card set months ago is due for review. They cannot tell you whether your specific carrier's specific invoice matches your specific contract, which is a line-by-line question these indexes do not answer.**

A shipper reading that trucking costs rose 8.1% to 10.9% year over year, and gasoline 37.1%, can reasonably conclude that a rate card frozen since last year is worth re-opening. That conclusion is sound and it is the limit of what national index data supports.

What it cannot do is substitute for checking the actual invoice against the actual contract. A carrier could raise a rate in line with the index and still bill the wrong accessorial rate, apply a surcharge tier that does not match the stated benchmark, or double-bill a detention charge already covered by a demurrage allowance elsewhere in the agreement.

The index data answers a negotiating question: is the market moving. The invoice-to-contract match answers a compliance question: is this specific bill correct. Both matter, and neither one does the other's job.

## 6. How do you audit a Denver freight invoice against these inputs?

**Start with the accessorial lines specific to Denver's lane structure: grade surcharges, deadhead charges, and fuel benchmark dates, and match each to the contract's stated rate and the operational event it claims happened. Then compare the linehaul rate trend against the long-distance truckload PPI series to judge whether the base rate itself is due for renegotiation, keeping that as a separate step from the line-by-line accessorial check.**

The line-by-line check comes first because it catches invoices that are wrong regardless of what the market is doing. A fuel surcharge keyed to a two-year-old benchmark is wrong on its own terms, independent of whether fuel costs went up or down since.

The market-trend check comes second and answers a different question: given that trucking and fuel costs have moved this much this year, is the base rate on file still the rate a carrier would offer today. That is a renegotiation input, not an invoice-accuracy input, and treating the two as the same step is how a contract compliance review misses both.

A full [freight and 3PL invoice audit](/answers/how-do-you-audit-freight-and-3pl-invoices) runs both checks together across a shipper's carrier base, which is what turns a one-lane observation like this into a portfolio-level finding.

For the wider pattern this sits inside, start with the [margin drift](/guides/indirect-spend-audit-categories) guide.

## 7. Frequently Asked Questions (People Also Ask)

### Is there a Denver-specific freight rate index?

Not in the sources cited here. The BLS producer price index series used in this page measure national trucking and fuel costs, not a metro-specific rate. A Denver shipper can use the national trend as a directional signal but needs its own contract and invoice data to judge whether its specific lanes are priced fairly.

### What is a mountain or grade surcharge on a freight invoice?

It is a charge carriers apply for the extra fuel a truck burns climbing graded terrain, billed separately from the linehaul rate. It is legitimate when the route segment billed actually includes the graded portion. An audit checks the segment against the route, not just whether the charge appears.

### Why does Denver have more deadhead or repositioning charges than other markets?

Denver's freight base moves more inbound volume than outbound volume on several regional lanes. A carrier that cannot find a return load prices that empty mile into a repositioning charge. The charge is legitimate when the empty mile actually happened and the rate matches the carrier's own tariff.

### How much have trucking costs risen recently?

Per the BLS Producer Price Index for truck transportation of freight (series WPU3012), the July 2026 index stood at 170.984, up 10.9% year over year, read September 6, 2026. Long-distance truckload trucking (series PCU484121484121) rose 8.1% year over year to 195.575 over the same period.

### How much has fuel cost risen recently?

Per the BLS Producer Price Index for fuels and related products and power, gasoline series WPU0571 stood at 302.759 in July 2026, up 37.1% year over year, read September 6, 2026. This is a national gasoline figure, not a Denver-specific or diesel-specific reading.

### Should I renegotiate my Denver freight rate based on this data?

The data supports opening the conversation: trucking and fuel costs have both risen substantially over the past year. Whether your specific rate needs to change depends on your contract terms and your carrier's actual cost structure, which this national index data cannot determine on its own.

### What is detention and why does it matter for Denver shipments?

Detention is a charge for time a truck waits at a dock beyond a contract's free-time allowance. It matters wherever dock capacity is limited relative to freight volume. An audit checks arrival and departure timestamps against the contract's free-time terms before accepting the billed hours.

### Does a rising fuel index mean my fuel surcharge is now higher?

Only if your surcharge table is keyed correctly to a current benchmark. A surcharge formula produces a higher charge automatically as the referenced fuel price rises, but only if the invoice is actually using the current benchmark period rather than a stale one carried over from an earlier table.

### Can software catch these Denver-specific accessorial errors automatically?

Software that checks invoices against configured rules can flag a mismatch once the Denver-specific accessorial rates, lane definitions and surcharge benchmarks are correctly configured in it. Configuring those rules correctly is itself the work a contract compliance review does first.

### Is contract complexity quietly draining your operating margin?

A small systematic drift between your negotiated contracts and your actual vendor billing compounds quietly across a year of invoices. Stop guessing at your exposure and run a targeted audit.

**[Take the Free Screener → https://valuexpa.com/margin-drift-screener](https://valuexpa.com/margin-drift-screener)**

## Executive Summary

Truck transportation costs, measured by the Producer Price Index for truck transportation of freight (BLS series WPU3012), stood at 170.984 in July 2026, up 10.9% year over year, read September 6, 2026. Long-distance truckload trucking specifically (BLS series PCU484121484121) rose 8.1% year over year to an index of 195.575 over the same period. Gasoline, tracked in the PPI for fuels and related products and power (series WPU0571), rose 37.1% year over year to 302.759. None of these three series is Denver-specific. No series in the proof registry breaks freight cost out by metro or by lane. What they establish is the direction and scale of the two inputs a Denver-lane fuel surcharge and accessorial schedule are built on: the underlying trucking cost base and the fuel cost that sets the surcharge trigger. A surcharge schedule negotiated before this year's increase is now measured against a stale reference point, wherever the freight moves. What changes for a Denver shipper is not the surcharge formula. It is the size of the gap between what that formula should now produce and what a carrier invoice bills when the fuel index the surcharge references is not re-checked against the current PPI reading. Denver's own lane structure, mountain fuel stops and backhaul-scarce lanes out of the market, adds accessorial categories that a flatter regional lane does not carry at all.

## 1. What is different about freight billing in Denver?

Denver freight billing differs in two structural ways: carriers price mountain-grade fuel consumption separately from flat-lane fuel, and backhaul capacity out of Denver is thinner than inbound capacity, which shows up as deadhead and repositioning accessorials rather than a higher base rate. Neither shows up if an invoice audit only checks the linehaul rate against the rate card; both live in accessorial lines that a rate-card-only review skips entirely. A truck climbing into or out of Denver on I-70 or I-25 through the foothills burns fuel at a different rate than the same truck on a flat interstate segment. Carriers account for this with a grade or mountain surcharge, billed as a separate line, not folded into the linehaul rate. Denver also has a backhaul imbalance: more freight moves in than moves out on several regional lanes. A carrier that cannot find a return load prices that risk into a [deadhead or repositioning charge](/guides/duplicate-freight-billing-and-the-multi-carrier) on the outbound leg, whether or not the shipper's contract names that charge. Both charges are legitimate cost recovery when the underlying event happened. The audit question is not whether the charge is real. It is whether the invoice actually documents the grade segment or the empty mile it is billing for, and whether the rate applied matches what the carrier's own tariff states for that accessorial.

## 2. How does the current fuel cost trend affect a Denver fuel surcharge?

Gasoline prices, tracked in the PPI for fuels and related products and power (BLS series WPU0571), rose 37.1% year over year to an index of 302.759 in July 2026, read September 6, 2026. A fuel surcharge table keys its tier to a fuel price benchmark; when the underlying benchmark moves this much this fast, a surcharge schedule set even a few months earlier is testing invoices against a number the market has already passed. A fuel surcharge is a lookup: the carrier or 3PL states a benchmark fuel price, usually diesel, and a surcharge percentage that adjusts as that benchmark moves through defined bands. The mechanism works only if the benchmark used on the invoice is the current one. The gasoline PPI figure above is not the diesel figure a Denver freight contract would typically reference, and the registry does not carry a diesel-specific reading for this market. What it does establish is that fuel costs generally have moved sharply within the year, which is exactly the condition under which a stale surcharge reference produces the widest gap between contract and invoice. The audit step this supports is narrow and specific: pull the benchmark actually printed on the invoice, and confirm it is the current period's reading rather than a table left over from the last contract renewal.

## 3. What does the long-distance trucking cost trend mean for Denver's long-haul lanes?

Long-distance truckload trucking costs, measured by BLS series PCU484121484121, rose 8.1% year over year to an index of 195.575 in July 2026, read September 6, 2026. Denver's freight base is disproportionately long-haul rather than short regional runs, so a cost trend measured at the long-distance truckload level applies more directly to a typical Denver outbound shipment than it would to a metro with mostly short-haul lanes. Denver is not adjacent to another major freight market at short-haul distance in most directions. Freight moving out of Denver toward the coasts, the Midwest, or the Gulf runs long-haul lane lengths more often than the short regional hops common near denser freight corridors. That lane-length profile is why the long-distance truckload PPI series is the more relevant of the two trucking-cost series here, more relevant than the general truck transportation of freight series, even though neither is Denver-specific. A rate card negotiated for Denver's long-haul lane mix should be tested against a trend built on the same lane length, not against a nearby short-haul benchmark that moves differently. The number itself does not tell a shipper what their own rate should be. It tells them the direction the underlying cost has moved since the rate was last set, which is the fact an audit needs before it can ask whether the current rate is still defensible.

## 4. Which accessorial categories should a Denver shipper check first?

Four accessorial categories carry Denver-specific risk: mountain or grade surcharges, deadhead and repositioning charges tied to the backhaul imbalance, fuel surcharges keyed to a stale benchmark, and detention charges at facilities near the metro's limited dock capacity. Each is a legitimate charge type when documented correctly and a drift source when the invoice does not match the underlying event or the current tariff rate. - Mountain or grade surcharge: Billed for elevation-driven fuel consumption on specific route segments. Check that the segment billed actually includes the graded portion of the route. - Deadhead and repositioning: Billed when a carrier cannot secure a return load out of the market. Check that an empty mile was actually driven and that the rate matches the carrier's own published accessorial rate. - Fuel surcharge benchmark: Keyed to a published fuel index. Check the benchmark period printed on the invoice against the current reading, not a table carried over from the last renewal. - Detention at origin or destination: Billed when a truck waits beyond a free time allowance at a dock. Check the arrival and departure timestamps against the contract's free-time terms before accepting the charge as billed.

## 5. Can this cost data tell you whether your own Denver freight rate is fair?

No. The PPI series cited here measure national trucking and fuel cost trends, not a Denver-specific rate, and not your contract's actual terms. They establish direction and scale of cost movement, which tells you whether a rate card set months ago is due for review. They cannot tell you whether your specific carrier's specific invoice matches your specific contract, which is a line-by-line question these indexes do not answer. A shipper reading that trucking costs rose 8.1% to 10.9% year over year, and gasoline 37.1%, can reasonably conclude that a rate card frozen since last year is worth re-opening. That conclusion is sound and it is the limit of what national index data supports. What it cannot do is substitute for checking the actual invoice against the actual contract. A carrier could raise a rate in line with the index and still bill the wrong accessorial rate, apply a surcharge tier that does not match the stated benchmark, or double-bill a detention charge already covered by a demurrage allowance elsewhere in the agreement. The index data answers a negotiating question: is the market moving. The invoice-to-contract match answers a compliance question: is this specific bill correct. Both matter, and neither one does the other's job.

## 6. How do you audit a Denver freight invoice against these inputs?

Start with the accessorial lines specific to Denver's lane structure: grade surcharges, deadhead charges, and fuel benchmark dates, and match each to the contract's stated rate and the operational event it claims happened. Then compare the linehaul rate trend against the long-distance truckload PPI series to judge whether the base rate itself is due for renegotiation, keeping that as a separate step from the line-by-line accessorial check. The line-by-line check comes first because it catches invoices that are wrong regardless of what the market is doing. A fuel surcharge keyed to a two-year-old benchmark is wrong on its own terms, independent of whether fuel costs went up or down since. The market-trend check comes second and answers a different question: given that trucking and fuel costs have moved this much this year, is the base rate on file still the rate a carrier would offer today. That is a renegotiation input, not an invoice-accuracy input, and treating the two as the same step is how a contract compliance review misses both. A full [freight and 3PL invoice audit](/answers/how-do-you-audit-freight-and-3pl-invoices) runs both checks together across a shipper's carrier base, which is what turns a one-lane observation like this into a portfolio-level finding. For the wider pattern this sits inside, start with the [margin drift](/guides/indirect-spend-audit-categories) guide.

## Common questions

### Is there a Denver-specific freight rate index?

Not in the sources cited here. The BLS producer price index series used in this page measure national trucking and fuel costs, not a metro-specific rate. A Denver shipper can use the national trend as a directional signal but needs its own contract and invoice data to judge whether its specific lanes are priced fairly.

### What is a mountain or grade surcharge on a freight invoice?

It is a charge carriers apply for the extra fuel a truck burns climbing graded terrain, billed separately from the linehaul rate. It is legitimate when the route segment billed actually includes the graded portion. An audit checks the segment against the route, not just whether the charge appears.

### Why does Denver have more deadhead or repositioning charges than other markets?

Denver's freight base moves more inbound volume than outbound volume on several regional lanes. A carrier that cannot find a return load prices that empty mile into a repositioning charge. The charge is legitimate when the empty mile actually happened and the rate matches the carrier's own tariff.

### How much have trucking costs risen recently?

Per the BLS Producer Price Index for truck transportation of freight (series WPU3012), the July 2026 index stood at 170.984, up 10.9% year over year, read September 6, 2026. Long-distance truckload trucking (series PCU484121484121) rose 8.1% year over year to 195.575 over the same period.

### How much has fuel cost risen recently?

Per the BLS Producer Price Index for fuels and related products and power, gasoline series WPU0571 stood at 302.759 in July 2026, up 37.1% year over year, read September 6, 2026. This is a national gasoline figure, not a Denver-specific or diesel-specific reading.

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