Summer Brings Modest Increases in Diesel and Gas Prices Across the U.S.
As summer continues and fuel demand climbs, both diesel and gasoline prices are gradually increasing across the United States, according to the latest report from the U.S. Energy Information Administration (EIA), released July 14. This trend, although modest, reflects seasonal shifts in travel and consumption patterns that traditionally lead to higher fuel costs during the warmer months.
Diesel Price Overview
The national average on-highway diesel price rose by 2 cents this week, reaching $3.758 per gallon. Regionally, the Rocky Mountain area experienced the most significant increase, with a 5-cent rise to $3.713 per gallon. The West Coast saw a 4-cent uptick to $4.498, though prices without California were slightly lower at $4.122.
On the East Coast, diesel prices increased by 3 cents to $3.793, while the Gulf Coast recorded a 2-cent rise to $3.403. Interestingly, the Midwest held steady at $3.733 per gallon, showing no week-over-week change.
AAA’s estimates differ slightly from the EIA, reporting a national diesel price average of $3.721 — 4 cents lower than the EIA’s figure and 14 cents less than this time last year. These numbers suggest that while diesel prices are inching up, they remain more stable compared to 2024.
Gasoline Price Trends
Gasoline prices also saw a slight increase, with the national average reaching $3.130 per gallon — up 1 cent from the previous week. However, regional trends varied more widely than diesel.
In the Gulf Coast and Midwest, prices jumped 5 cents to $2.738 and $3.033, respectively. The Rocky Mountain region saw a 1-cent decline to $3.128, while the East Coast experienced a 3-cent drop to $2.987. On the West Coast, prices also fell 3 cents to $4.041, or $3.780 when excluding California.
AAA’s current national average for gasoline is slightly higher at $3.150 per gallon, 2 cents above the EIA’s number but still 37 cents lower than this time last year. In a recent press release, AAA noted that the national gas price dipped to $3.14 before rebounding to $3.17 — marking the lowest summer average in four years.
Fuel Market Context
The relatively low and steady prices observed throughout 2025 so far are attributed to a robust supply in the global oil market. AAA emphasized that despite minor week-over-week fluctuations, prices have remained more consistent this summer than in recent years. This stability has helped ease pressure on consumers and the transportation sector alike, even as demand picks up during the peak travel season.
With the second half of the year underway, continued monitoring of diesel and gas prices will be essential for businesses, fleet operators, and consumers planning for transportation budgets and travel costs.
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