Why Truckers Still Lose Money When Diesel Spikes: Understanding the Fuel Surcharge Illusion

5/23/2026

Fuel surcharges are supposed to shield trucking companies from rising diesel prices, but many carriers still lose money when fuel spikes hit.

Fuel surcharges are supposed to help carriers survive diesel spikes. But many truckers say the math simply does not work.

Diesel fuel prices over $8 a gallon are displayed at a Mobil station on May 4 in Los Angeles, California.

Delayed adjustments, unrealistic fuel benchmarks, and broker controlled surcharge structures often leave owner operators and fleets absorbing costs themselves. As diesel volatility continues, many truckers argue the fuel surcharge system protects everyone except the carrier buying the fuel.

By Susan Conners
May 23, 2026
Diesel Market Watch

The Fuel Surcharge Illusion: Why Truckers Still Lose Money When Diesel Spikes

Fuel surcharges were originally designed to protect trucking companies from unpredictable diesel price swings. On paper, the concept sounds fair. When fuel prices rise, carriers receive extra compensation to offset higher operating costs. In reality, many owner operators and fleets discover that fuel surcharge programs rarely cover the full increase. The result is a frustrating cycle where trucking companies haul the same freight, work the same hours, and still watch profit margins disappear every time diesel climbs.

What Is a Fuel Surcharge?

A fuel surcharge, often called FSC, is an additional fee added to freight rates to help carriers manage rising fuel costs.
Most fuel surcharge programs are tied to:

National diesel averages
Regional fuel indexes
Mileage based formulas
Percentage based calculations

Many brokers and shippers use the weekly diesel average published by the U.S. Energy Information Administration to determine surcharge rates.
The idea is simple:

Establish a baseline fuel price
Monitor diesel price increases
Add compensation once prices exceed the baseline

However, the math often works against carriers. [1]

Why Fuel Surcharges Lag Behind Reality

One of the biggest problems with FSC programs is timing. [2]
Fuel prices at truck stops can rise overnight, but many surcharge programs update:

Weekly
Bi weekly
Monthly

That delay creates a gap where carriers pay higher pump prices immediately while compensation arrives later.

Example
Imagine diesel jumps from:

$3.80 per gallon to $4.60 per gallon in one week

A carrier fueling daily now absorbs:

$0.80 more per gallon instantly

But the shipper may not update its FSC formula until the following week.
During that period:

The carrier pays the full increase
The broker maintains margins
The shipper avoids immediate adjustments

For small fleets operating on tight cash flow, that delay can become devastating.

Diesel fuel price chart showing a steady rise in cost within the last month and last year.

AAA: National Average Fuel Rates on May 23, 2026.

Truck Stop Prices Often Higher Than Government Averages

Another major issue is the benchmark itself.
Many surcharge programs use national average diesel prices. Unfortunately, truck drivers rarely buy fuel at those exact prices.

Real world costs include:

Interstate truck stop markups
Regional shortages
Urban pricing premiums
Seasonal spikes
Taxes and fees

Example
Government diesel average:

$4.10 per gallon

Actual truck stop price:

$4.65 per gallon

Fuel surcharge reimbursement:

Based on $4.10

Carrier reality:

Paying $0.55 more per gallon than the formula recognizes

That difference comes directly out of carrier profits. [3][4]

Brokers Often Keep Part of the Fuel Surcharge

Many owner operators believe the entire FSC goes directly to the carrier.
That is not always true.

Diesel Prices Keep Rising but Fuel Surcharges Rarely Cover the Damage

In some freight arrangements:

Shippers pay brokers a full surcharge
Brokers negotiate separate carrier rates
Carriers receive only a portion of the FSC

The broker may classify the remainder as:

Margin protection
Administrative adjustment
Contract spread

This creates frustration because carriers are the ones physically buying fuel while intermediaries may still profit from rising diesel prices. [5]

Fuel Efficient Trucks Still Get Penalized

Fuel surcharge systems are often based on standard mileage assumptions rather than actual fuel consumption.
For example:

FSC formula assumes 6 MPG
Carrier operates at 8 MPG

At first glance, this sounds beneficial. But the problem appears when freight rates themselves decrease because shippers assume the carrier already benefits from fuel efficiency.

In many cases:

Efficient carriers receive reduced line-haul rates
Fuel surcharges remain capped
Overall revenue still shrinks

Efficiency helps, but it rarely offsets aggressive freight pricing.

Empty Miles Are Rarely Covered

Fuel surcharges usually apply only to loaded miles.
That leaves carriers paying out of pocket for:

Deadhead miles
Repositioning trips
Traffic delays
Idling time
Detours

Real World Scenario
A carrier hauls:

500 loaded miles
120 empty miles returning

Fuel surcharge covers:

Only the 500 loaded miles

The remaining 120 miles:

Become an unreimbursed fuel expense

Over time, those unpaid miles eat deeply into profits.

Small Carriers Suffer the Most

Large fleets often have advantages such as:

Fuel contracts
Bulk purchasing discounts
Dedicated freight lanes
Stronger negotiating leverage

Small carriers and owner operators typically:

Pay retail diesel prices
Accept broker controlled FSC formulas
Have less leverage in negotiations

This creates an uneven playing field where independent truckers absorb more volatility than larger competitors.
Read more → How Long Can Small Car Haulers Survive

Why Fuel Surcharges Fail Truckers During Diesel Price Spikes

Diesel Spikes Also Affect More Than Fuel

When diesel prices rise, other operating costs often increase too.
These include:

Tire prices
Maintenance parts
Shipping supplies
Repair labor
Insurance costs

Fuel surcharges only address diesel itself, not the chain reaction affecting the entire trucking industry. That means carriers can receive a surcharge increase while still losing overall profitability.

Why Many Truckers Call FSC Programs an Illusion

Fuel surcharges sound protective in theory, but several realities reduce their effectiveness:

Updates lag behind real pump prices
Benchmarks rarely match truck stop costs
Empty miles remain uncovered
Brokers may retain part of the FSC
Rising operating costs extend beyond fuel alone

As diesel prices climb, carriers often discover the surcharge only softens the blow instead of eliminating it.

How Carriers Try to Protect Themselves

To reduce losses during fuel spikes, many trucking companies:

Negotiate custom FSC agreements
Avoid cheap freight during volatile markets
Use fuel cards with discounts
Optimize routes aggressively
Reduce unnecessary idle time
Focus on dedicated freight contracts

Some carriers also refuse loads with weak surcharge structures entirely.
Still, during severe diesel volatility, even disciplined operators can struggle to maintain margins.

Final Thoughts on Fuel Surcharge Illusions

Fuel surcharges were created to stabilize trucking during periods of fuel volatility, but modern freight markets have exposed major flaws in the system. Delayed adjustments, unrealistic benchmarks, and broker controlled structures often leave carriers covering part of the increase themselves. For many truck drivers, rising diesel prices do not simply reduce profits. They expose how fragile trucking margins truly are.