Arizona pump prices jump 15 cents in a week to $4.81 as refining costs outrun crude

Gasoline in Arizona jumped 15 cents a gallon this week to a state average of $4.81, and Sun City West hit $4.87, even as WTI eased on the week to near $92. When the pump climbs while crude pulls back, the pressure is coming from refining and wholesale, and that is the part of the chain that squeezes a retailer's fuel margin fastest.

The refining squeeze

WTI was near $92 a barrel Friday after a modest weekly pullback, with Brent around $104. Neither is at the extremes of the last quarter-century. WTI topped $145 in July 2008, and it ran past $120 after Russia's 2022 invasion of Ukraine, with Brent near $139.

For a forecourt operator, the gap matters more than the tape. Local pump costs are outrunning the crude move, which points to refinery hits feeding wholesale. When rack prices climb faster than a store can adjust the street, the retailer's margin can turn thin for a few days before retail catches up.

The September record

The national average this month is $4.30 a gallon, on track to set a new September record and above the prior September high of $3.83 from 2023, according to AAA. "Typically, the start of autumn brings lower gas prices, but lingering volatility in the Strait of Hormuz and the high cost of crude oil are driving up pump prices," said David Caltabiano of AAA Mountain West Group in a Thursday release.

High street prices change what a c-store sells. When drivers wince at $4.87, fuel volume can soften and the inside of the box carries more of the day, which is why operators lean harder on foodservice and loyalty offers to hold traffic when high prices cut fuel volume. None of that shows up in the AAA number, but it shows up on the P&L.

What to watch

Whether the refinery pressure eases. If outages come back and wholesale settles, street prices could soften even with crude where it is. The Strait of Hormuz is the other lever AAA is pointing at, and any move there could keep crude jumpy into October. And watch whether the September record holds through month-end, because a September this high resets what operators and drivers treat as normal heading into the fall.