Trump's red-dye diesel order leaves fleet savings to four federal departments and the states

Trump's own description of the order goes further than the paperwork behind it. "Tonight I'm going to sign a historic executive order to officially waive the off-road requirement and allow anyone to purchase tax-free red dye diesel for any reason," he said at the Nebraska rally ^[13]. According to NBC News, the White House fact sheet hands the follow-up to four cabinet departments and tells them to work on expanding access ^[2].

State taxes are the weaker half. Dyed fuel is cheaper because it is exempt from both federal and state excise taxes ^[7], and on the state side the White House can only encourage suspension ^[2]. A fleet controller would ask whether a federal order can make a state-taxed gallon tax-free. By the administration's own account, it cannot. Until every state decides, an interstate carrier's saving will change at each state line.

The dye raises a compliance question. Farm and machinery diesel is dyed red so that regulators and inspectors can tell it apart from taxed road diesel ^[5]. In a state that keeps its road tax, red fuel in a highway truck still tells an inspector that the state tax was not paid. We do not know yet how those states will treat fuel that the federal order says anyone may buy.

Trump put the saving at more than $100 every time a typical trucker fills the tank ^[14]. NBC's report does not include the per-gallon tax figures behind that estimate, so a fleet cannot yet test it against its own routes.

The tax is also only one part of the price. Removing it lowers the pump price by the amount of the tax and nothing more. Since Feb. 28, diesel has risen roughly 25 percentage points faster than Brent crude and about 20 points faster than unleaded gasoline ^[10][11]. NBC attributes that gap to the escalation of the Ukraine war. Ukrainian drone strikes on Russian refineries forced the Kremlin to ban diesel exports at least through the end of this month ^[9].

The order also comes after the peak. Diesel hit a record $6.52 a gallon on Sept. 22, according to AAA, and average prices have eased slightly since ^[8]. Republican candidates had pressed the administration to respond to a rise of more than 30% in recent months ^[4].

I think the choice for fleets this quarter is how much of the saving to build into fuel surcharges and fixed-rate contracts. Passing the federal share through once the departments act is a defensible bet. A carrier that builds in a state's share before that state has suspended its tax is committing to a price it would have to reverse next quarter if the state keeps the tax.