Diesel is sitting at an all-time record. The Energy Information Administration’s September 21 reading put the national on-highway average at $6.529 a gallon — up 24.4 cents in a single week and $2.78 higher than a year ago — and now the statehouses are moving. Land Line reported this week that Massachusetts’ governor has proposed suspending the state’s 24-cent fuel tax on gas and diesel for November and December, Indiana has paused its gas taxes through October 5, Utah has cut its gas tax 15 percent through year-end, Illinois has pushed a planned fuel-tax increase to January 1, and Pennsylvania, Ohio, New York, Connecticut, Tennessee, Virginia and California are all weighing relief of their own.

Good news, mostly. But for a carrier running interstate under IFTA, a fuel-tax holiday is not the simple discount it looks like at the pump — and two of the biggest cuts on that list do not apply to diesel at all. Chase the headline without doing the math and you can burn more in deadhead and quarterly true-ups than the holiday ever saves you. Here is what actually changed, and the fuel-buying system to run before your next fill.

What Actually Changed This Week

Read the fine print before you reroute a single truck. Massachusetts’ two-month suspension would cover both gasoline and diesel — real money in a state where Land Line notes diesel is averaging $6.39 against $3.85 a year ago — but it still needs legislative approval, so it is a proposal, not a law. Indiana’s pause, which now covers both its 7 percent gas use tax and the 36-cent gas excise tax through October 5, is gasoline only: diesel and the state’s motor carrier obligations are untouched, so an Indiana fill saves your pickup money and your Class 8 nothing. Utah’s 15 percent cut is likewise gas-only. Kentucky’s dime-a-gallon cut on both fuels and Georgia’s suspension already expired earlier this summer. The two developments that matter most to a diesel buyer right now are Massachusetts — if it passes — and Illinois’ delayed increase, which quietly keeps every Illinois gallon 1.3 cents cheaper than planned until January 1.

Meanwhile the regional spread underneath those taxes has gotten enormous. EIA’s same September 21 table shows the Gulf Coast averaging $6.177 while the Midwest sits at $6.680 and California at $8.246. When the gap between regions is 50 cents to two dollars a gallon, where you fuel is no longer a driver-preference question. It is a line item — fuel is 48.2 cents of every operating mile, per the American Transportation Research Institute’s 2026 cost report, the largest cost on your truck after the driver.

Why the Pump Price Lies to an IFTA Carrier

Here is the mechanic most one-truck operations never get told. Under IFTA, the fuel tax you ultimately owe each state is set by the miles you drive in that state — your quarterly return takes your miles per jurisdiction, divides by your fleet’s average MPG, and taxes those gallons at each state’s rate. The tax you pay at the pump is just a deposit: it becomes a credit on the return, and every quarter the credits and the mileage-based liabilities settle up. Buy all your fuel in a high-tax state you barely drive through and you get it back later; buy everything in a low-tax state while running high-tax miles and the quarterly bill arrives like a surprise brake job.

The consequence is the Real-Cost Rule: since the tax portion of every gallon washes out on the IFTA return, the true price of fuel at any pump is the posted price minus that state’s per-gallon diesel tax. Say the truck stop on your side of a state line posts $6.40 with 20 cents of state tax in it — real cost $6.20 — while the stop 15 miles ahead posts $6.60 with 65 cents of tax, for a real cost of $5.95. The “expensive” station is a quarter a gallon cheaper, and on a 200-gallon fill that is $50 per fill, every fill, forever. Carriers who route fuel stops on the big sign instead of the base price hand that money back to the road, week after week. The current tax rate for every jurisdiction is published each quarter in the IFTA, Inc. tax rate matrix — that table, not the billboard, is your shopping list.

What a Tax Holiday Does to Your Quarterly Return

A suspension flips the math for exactly as long as it lasts. While a state’s diesel tax is suspended, a gallon bought there carries no tax — which means no credit on your return — and the state’s IFTA rate for that period drops with it, so your miles there cost less too. During a genuine diesel holiday, the state briefly becomes what the pump says it is: a place where the posted price is the real price. That makes a passed Massachusetts suspension a legitimate reason to fuel in Massachusetts in November and December if you run New England — and it makes the calendar part of your fuel plan. Write the boundary dates where your dispatcher can see them: Indiana’s gas-only pause ends October 5, Illinois’ deferred increase lands January 1, and Massachusetts is a watch-this-space until the legislature votes. Fuel bought a day after a holiday ends settles at the full rate, and the quarter your holiday straddles will have two different rates for the same state — so keep every receipt and make sure whoever files your IFTA return knows the split. If a service files it for you, ask them this week how they are handling suspended jurisdictions; their answer tells you a lot, the same way a statement audit told you plenty in our fuel-card fee investigation.

Do Not Let a Holiday Eat Your Surcharge

Expect at least one sharp shipper or broker to try this: “the state cut fuel taxes, so let’s trim the fuel surcharge.” Hold the line. If you built your surcharge the way we teach in How to Build a Fuel Surcharge Table, it pegs to the national EIA average — an average that just set an all-time record — and any state holiday is already reflected in that number automatically. When the ask comes, here is the answer:

The Fuel-Buy Reset to Run This Week

Give this one hour. First, pull the current quarter’s rate matrix from IFTA, Inc. and write the diesel tax for every state your trucks touched last month on one sheet. Second, take your three most common fuel stops and compute the real cost at each — posted price minus state tax — then do the same for the nearest alternative across each state line; you are looking for any stop where crossing a border inside your existing route saves 15 cents or more real, with no added deadhead. Third, reset your fuel-card rules or driver instructions to name the winning stops — discounts stack on top of the base-price decision, they do not replace it. Fourth, put October 5 and January 1 on the calendar, plus a note to check whether Massachusetts passes its suspension before November. Fifth, fold the whole thing into your weekly cash routine — at these prices, fuel is the fastest-moving number in the cash discipline we laid out this week, and a nickel a gallon truly captured is worth more than most rate negotiations you will win this month.

Bottom Line

Fuel-tax relief is coming in pieces — gas-only here, two months there, a delayed increase somewhere else — while diesel itself sits at a record $6.529. The carriers who benefit will not be the ones who chase the biggest sign; they will be the ones who buy on pump-minus-tax, know exactly what a suspension does to the quarterly return, and refuse to let a headline renegotiate a surcharge that is pegged to reality. The state may be giving a little back this fall. Make sure it lands in your account and not the truck stop’s.

Innovative Logistics Group