The national on-highway diesel average reached $5.652 per gallon for the week ending August 24, according to the Energy Information Administration release published August 25. The figure represents a 19.8 cent increase from the prior week's $5.454 and a rise of $1.944, or roughly 52%, from the same week in 2025. Diesel now sits $2.001 above where it stood two years ago.
Every region posted an increase. The Gulf Coast recorded the largest weekly move at 24.4 cents, bringing that region to $5.481. The West Coast climbed 20.4 cents to $6.407, while California alone reached $7.040 after a 25.5 cent gain. The Midwest rose 20.1 cents to $5.636 and the Lower Atlantic, the cheapest region in the survey, gained 14.6 cents to $5.350.
East Coast prices averaged $5.498 after a 15.8 cent increase. New England reached $5.716 and the Central Atlantic $5.840. The Rocky Mountain region posted the smallest gain at 11 cents, closing at $5.537.
Gasoline moved far less over the same period. The national regular grade average rose 3.6 cents to $4.085, up 93.8 cents from a year earlier. The gap between the two fuels widened again, with diesel now running roughly $1.57 above regular gasoline nationally. EIA publishes both series every Monday and will issue the next update on September 1.
Source: U.S. Energy Information Administration - https://www.eia.gov/petroleum/gasdiesel/