The national average price for on-highway diesel fuel reached 5.313 dollars per gallon on July 27, 2026, according to the US Energy Information Administration weekly fuel report. That figure represents a 17.9 cent increase from the previous week and comes after diesel climbed from 4.796 dollars per gallon on July 13 to 5.134 dollars per gallon on July 20, marking two consecutive weeks of sharp gains.
Diesel prices are now running 1.508 dollars higher than the same week last year and 1.545 dollars above where they stood two years ago. Every region tracked by the EIA showed increases. The West Coast posted the highest regional average at 6.067 dollars per gallon, while California alone reached 6.670 dollars per gallon. The Gulf Coast recorded the lowest regional price at 5.087 dollars per gallon, still up more than 14 cents from the prior week.
The Midwest saw one of the steepest weekly jumps, rising 20.8 cents to reach 5.196 dollars per gallon. The Central Atlantic region posted an even larger single week increase of nearly 21 cents.
Rising diesel costs directly affect operating expenses for trucking fleets, since fuel remains one of the largest line items after labor. Fleet managers watching weekly EIA data are factoring the sustained increases into fuel surcharge calculations and route planning as the price climb has continued for multiple consecutive reporting periods.