Why has RBOB gasoline climbed 6.7% to 3.312 over the past month?

RBOB gasoline, the wholesale contract that sets what most marketers pay for a gallon before taxes and freight, is 3.312, up 6.7% over the past month. For anyone buying fuel to resell, the move matters less than its cause. A higher crude bill and a tighter refining system call for different responses from an operator, so the first job is to tell the two apart.

Brent crude is 102.25, up 6.9% over the same month. That is almost the identical move to gasoline, which points straight at crude as the main driver. When the barrel and the wholesale gallon rise by close to the same share, the refiner is passing through a higher input cost more than it is widening its own cut. Brent's 30-day high was 108.75 and its low was 71.57, so the barrel has covered a lot of ground in a month, and gasoline has tracked it the whole way up.

The refining margin points the same way. The 3:2:1 crack spread is 64.65, up 3.2 over the month. That is a small gain next to the size of the crude move. If refiners were capturing more value per barrel, the crack would have widened by far more than 3.2 points. Most of the gasoline increase is the barrel underneath it, not the processing margin on top.

The easy read breaks on diesel. At 6.382, it is up 14.0% over the month, roughly double the gasoline move. The two products come off the same barrel, so when one runs that far ahead of the other, something is pulling on the middle of the barrel specifically. The 30-day high for diesel was 6.529 against a low of 3.459, a wider swing than gasoline showed over the same window. Gasoline rose with crude. Diesel rose with crude and then kept going.

Refinery utilization is down 7.1% over the month. Lower runs mean fewer finished barrels and tighter supply in both gasoline and diesel, so this adds to the gasoline firmness but cannot explain why diesel pulled so far ahead.

The wire explains the diesel gap. One headline reports smoke over Riyadh after an alleged Houthi strike on an Aramco refinery, which threatens crude supply. Another reports Europe has lost 30 refineries since 2009 and now imports diesel, leaving that market thin. Diesel has the least slack in the system right now, so a supply shock lands harder there than on gasoline. That shows up in the numbers: 14.0% on diesel against 6.7% on gasoline.

The retail side of diesel moved too. The diesel retail-wholesale spread is 1.627 now, up 0.523 over the month, so sellers on the street have more room over their cost than they did thirty days ago. For gasoline there is no matching signal in the data here, which again fits the read that the gasoline move is a cost pass-through rather than a margin event.

Two wire items point the other way on crude, and they could matter for where gasoline goes next. One reports oil prices dropping, with WTI down 3.78% and Brent below 100, on talk of reserve releases. Another reports the G7 agreed to release 100 million barrels of reserve diesel. Those are announced actions aimed at the distillate shortage, and if the barrels actually reach the market, the risk premium that has lifted both crude and gasoline could ease. I would not call a direction on it. Reserve-release talk has moved prices before the barrels ever shipped, and talk can reverse.

So the answer to the gasoline question is cleaner than the diesel noise around it suggests. RBOB is up 6.7% mostly because crude is up 6.9%, with only a small assist from a firmer crack and softer refinery runs. The gallon is riding the barrel. The 14.0% diesel move is a separate and larger event. Distillate is tight on its own, and the refinery attack and a thinner European market that now leans on imports have pushed it further. The two products share a barrel, and that is the only reason the gasoline chart looks dramatic.

For a fuel operator, the practical read is that the gasoline increase is a cost coming through from crude. Wholesale margins in gasoline have not blown out. Pass it through and watch crude. The place to pay real attention is diesel, where the price, the run cuts, the supply headlines, and the widening street spread all point the same way. Your buying could move on diesel this month. On gasoline you are mostly just following the barrel.