Iowa diesel drops 17 cents to $4.35 as pump prices ease

Iowa diesel fell 17 cents in a week to a statewide average of $4.35 a gallon, according to AAA's latest fuel report. For carriers running Iowa lanes, that is real money, and it is the number that feeds most fuel surcharge tables.

Surcharge relief

Fuel surcharges are built on diesel. Most carrier programs peg the surcharge to a weekly diesel average and adjust in cent bands, so a 17-cent drop in a week pulls the accessorial down for shippers and thins what haulers collect on top of the linehaul.

That cuts both ways. Shippers paying the surcharge get a small break. Carriers who bought fuel high and billed the surcharge on a lag can lose a few cents of margin while the benchmark catches down. Diesel at $4.35 is still 77 cents above Iowa's year-ago average of $3.58, so the relief is relative.

Gasoline flat

Gasoline barely moved. Iowa regular unleaded is $3.53 a gallon, down a penny on the week but 57 cents higher than a year ago. The national average fell 8 cents to $3.85. Diesel is doing the heavy lifting on the way down, which matters more to freight than to the c-store forecourt, where gasoline gallons drive traffic.

Gulf freight cost

The one foreign item worth a US operator's attention is shipping. Cameroon's diesel import cost jumped 60.7% between February and May, and its statistics office blamed Persian Gulf tension for disrupting energy markets and lifting shipping rates. Cameroon's retail prices do not touch a US jobber. Gulf shipping risk does, because the same disruption that raises a West African import bill feeds into global diesel and tanker costs that eventually reach the Gulf Coast. Watch it as a possible floor under diesel.

What to watch

Whether the diesel slide holds through next week's AAA print, or whether it was a one-week catch-down to softer crude. If diesel keeps easing, surcharge tables will follow a week behind and shippers will see it in the next billing cycle. If Gulf tension tightens tanker supply, the import cost pressure showing up in places like Cameroon could put a floor under US diesel before the surcharge relief reaches carriers.