Diesel Hit $5.35 the Same Week Gasoline Fell to $4.08

Why It Matters

Two fuels moved in opposite directions inside one government table. The Energy Information Administration’s August 4 release put national on-highway diesel at $5.348 a gallon for the week ended August 3, up 3.5 cents. Regular gasoline in the same release fell 1.7 cents to $4.079. AAA headlined its summary of that stretch “Lower Crude Oil Prices Driving Down National Average,” a sentence that describes one of the two fuels.

The reason sits in the agency’s own cost breakdown. EIA attributes 52% of a gallon of regular gasoline to crude oil and 42% of a gallon of diesel. At the May 2026 retail prices in that chart, $4.48 and $5.60, crude works out to $2.33 inside gasoline and $2.35 inside diesel. The two fuels carry almost the same crude cost, two cents apart, while refining, distribution and taxes come to $2.15 in gasoline and $3.25 in diesel.

That is the whole $1.12 gap between the two retail prices, and none of it is crude. A falling crude price pulls hardest where crude is the largest share, which is gasoline. Diesel is what moves freight, and EIA puts distribution and marketing at 23% of a diesel gallon against 15% of a gasoline gallon. The Market Context reported on July 31 that Exxon’s profit doubled to $14.5 billion with Brent at $104.52.

The diesel premium has roughly doubled twice in two years

EIA prints a change-from-year-ago and a change-from-two-years-ago column beside every price, which makes the history recoverable from a single row pair. Diesel is $1.548 above its level of a year earlier and $1.593 above two years earlier. Regular gasoline is up $0.939 and $0.631 on the same two comparisons.

Work those back and the gap between the two fuels was 30.7 cents a gallon two years ago. A year ago it was 66.0 cents. In the week ended August 3 it was $1.269. The premium multiplied 2.15 times in the first of those years and 1.92 times in the second, for 4.13 times across the pair. Every one of those figures comes from arithmetic on the two EIA rows rather than from a separate series.

The percentage moves diverge by the same logic. Diesel is 40.7% above its year-earlier level and regular gasoline is 29.9% above its own, a spread of 10.8 percentage points. AAA’s daily figures for August 8 give 42.5% and 27.4%, a wider spread on a later date.

Diesel rose in four of EIA’s five regions while the national gasoline average fell

The weekly increase was not a single regional distortion, because diesel rose in four of the five EIA petroleum districts in the week ended August 3 and fell in one. The Rocky Mountain district added 14.4 cents, the largest weekly move of the five. The Midwest followed at 6.6 cents, the West Coast at 6.3 cents and the Gulf Coast at 5.4 cents. The East Coast was the exception at 5.5 cents lower.

Levels remain far apart, with West Coast diesel at $6.130 a gallon and California at $6.716 against $5.141 on the Gulf Coast. The Gulf Coast also carries the largest year-over-year increase of the five districts at $1.699, which is the refining region rather than the expensive one.

Gasoline’s national average fell over the same week even though the fuel rose in three of the five districts. The two largest regional declines, 8.6 cents on the Gulf Coast and 5.3 cents on the East Coast, were enough to turn the weighted national number negative. A reader who checks only the national gasoline figure and only their own region can find both numbers correct and still disagree about the direction.

AAA and EIA publish different diesel prices, and the survey calendar explains the gap

The two most quoted fuel-price sources in the United States do not print the same number. EIA had diesel at $5.348 for the week ended August 3. AAA had it at $5.3176 on August 8, three cents lower. On regular gasoline the gap runs the same way, $4.079 against $4.0224, or 5.7 cents.

Neither figure is wrong, because EIA’s weekly series is a Monday survey of retail outlets covering a week that closed on August 3. AAA’s number is a daily average published on August 8, five days later. Diesel eased slightly across those five days, so the later reading is the lower one. When two fuel prices are quoted against each other in the same sentence, the date they were taken usually explains more of the difference than the sampling does.

Crude quotes carried a wider spread on August 7 than either fuel series did. Fortune reported Brent at $86.04 that morning. TheStreet had it at $81.85 about two hours later, and Forbes Advisor put the open at $83.49. A $4.19 range across three outlets on one morning is a timestamp problem rather than a data problem, and the two retail fuel series have it in smaller form.

Wages grew 3.2% over a year in which the freight fuel grew 40.7%

The Bureau of Labor Statistics put average hourly earnings at $37.62 in July, up 3.2% over the year, in the employment report it released on August 7. The Market Context covered that report the same morning, when payrolls fell 23,000 and the jobless rate fell as well. Diesel over the same twelve months rose 40.7% by EIA’s measure.

The gap does not reach households as a fuel bill, because most households do not buy diesel, and it reaches them instead through what diesel carries. The Department of Agriculture’s Economic Research Service predicts all food prices rise 3.1% in 2026, inside an interval of 2.3% to 3.8%. Food away from home is forecast at 3.5% and fresh vegetables at 6.8%. Those forecasts sit close to the wage number rather than to the diesel number.

The Market Context examined the household side of a fuel shock in June, when pump prices were reshaping American spending during the Iran conflict. The distinction that matters now is narrower. Gasoline is the price a household sees on a sign, and diesel is the price it pays inside everything delivered to a shelf.

What to watch

1. EIA’s next Gasoline and Diesel Fuel Update, scheduled for August 11. Read the change-from-week-ago column on the U.S. on-highway diesel row against the same column on the regular gasoline row, which is where the two fuels last pointed opposite ways.

2. The Bureau of Labor Statistics releases the July Consumer Price Index on Wednesday, August 12 at 8:30 AM ET. Read the “other motor fuels” line inside the motor fuel index, which is where diesel sits and which the headline energy figure blends into gasoline.

3. EIA’s Weekly Petroleum Status Report. Read the distillate fuel oil inventory level, the stock figure that sits behind the refining and distribution shares of a diesel gallon rather than behind the crude share.

4. EIA’s Petroleum Marketing Monthly, last updated August 3. Read the refiner price tables for distillate against motor gasoline, the wholesale split that the weekly retail averages cannot show.