U.S. refiners ran above 95% of capacity this summer, pulled hard by tight diesel

Diesel margins pulled the whole refining fleet harder this year, and haulers are the ones paying for it at the rack. EIA's Weekly Petroleum Status Report puts summer utilization north of 95%, well above the 92% that's been normal for May through September since 1991. Refiners don't run that hot for fun. They run it because diesel is scarce enough globally to make every incremental barrel worth cracking.

For carriers, that shows up as elevated diesel and fuel surcharges that aren't coming down. Prices have stayed up on global supply concerns, per RFD-TV's read, and nothing in the refining data says relief is close.

Yesway's diesel tilt

Diesel is more than a third of the fuel Yesway sells, C-Store Dive reports, because the chain parks its stores where the trucks are. That's a smart place to be right now. When diesel margins are fat and highway traffic is steady, a store weighted toward big-rig volume prints money that a gas-heavy corner lot can't match.

The flip side: a chain that leans on diesel gallons is exposed if freight volumes soften. For now the exposure is paying off.

$8B in farm relief

Trump announced $8 billion in farm relief tied to high diesel costs, the Carolina Journal reported. Farmers burn diesel through the whole growing season, so elevated prices hit them the same way they hit a fuel jobber running a delivery fleet. The relief doesn't lower the rack price. It just softens the blow for one buyer group while other diesel buyers keep paying.

Watch whether that sets any precedent. If diesel stays expensive into planting season, more pressure for relief could follow.

The summer pattern

Refiners normally run hardest May through September to build gasoline for driving season, then ease off. This year the pull came from diesel instead, and that changes the math on when supply loosens. Distillate-driven run rates don't necessarily fall off with gasoline demand the way the calendar usually dictates.

That matters for anyone pricing freight into Q4. If runs stay elevated on diesel economics, product supply may hold better than the seasonal playbook suggests, but the global tightness that started this isn't resolved.

What to watch

Whether diesel margins stay wide enough to keep refiners above 92% into the fall, since that's what's holding surcharges up. Watch distillate inventories in the next EIA report for any sign the tightness is easing. And watch whether the $8B farm package draws calls for broader diesel relief if prices don't come off. Carriers setting rates for winter should assume elevated diesel until the inventory numbers say otherwise.