May Diesel Trends Update
The national average price of a gallon of diesel decreased by more than 7 cents this week, and all five regions reported lower prices, ranging from just over 2 cents to more than 12 cents cheaper than a week ago.
The average price of a gallon of diesel decreased by more than 4 cents this week, and four of the five regions saw similar price improvements.
Work Truck | EIA
The average price of diesel remains above $5 nationwide and in every region of the U.S. However, the national average price dropped by more than 7 cents at the start of this week, and one region reported a 12.6-cent price drop.
The national average price of a gallon of on-highway diesel was $5.52 as reported May 25 by the U.S. Energy Information Administration (EIA).
The weekly report also provides a year-over-year pricing comparison, showing the national average is now $2.03 higher than in 2025 and $1.76 higher than the same time in 2024.
This week, average prices decreased across all five regions. The regional price average decreases ranged from 2.4 cents in the West Coast region to 12.6 cents in the Midwest region.
The most expensive place to buy diesel is California, at $7.38 per gallon, and the least costly is Oklahoma, at $4.94 per gallon.
In the final week of April, oil prices surged above $100 per barrel, and per-gallon diesel prices have remained high.
Regional Diesel Prices: 4th Week of May
Average diesel prices reported by region, as of May 26, were:
- East Coast: $5.39
- Midwest: $5.62
- Gulf Coast: $5.04
- Rocky Mountain: $5.49
- West Coast: $6.50
Regional Diesel Prices: 3rd Week of May
The average price of a gallon of diesel decreased by more than 4 cents this week, and four of the five regions saw similar price improvements.
Work Truck | EIA
Average diesel prices reported by region, as of May 18, were:
- East Coast: $5.42
- Midwest: $5.75
- Gulf Coast: $5.12
- Rocky Mountain: $5.55
- West Coast: $6.52
Regional Diesel Prices: 2nd Week of May
The average price of a gallon of diesel decreased slightly this week, by only 1/10th of a cent.
Work Truck | EIA
Average diesel prices reported by region, as of May 11, were:
- East Coast: $5.46
- Midwest: $5.81
- Gulf Coast: $5.15
- Rocky Mountain: $5.49
- West Coast: $6.56
Regional Diesel Prices: 1st Week of May
The average price of a gallon of diesel increased this week, with the national average price jumping by nearly 29 cents.
Work Truck | EIA
Average diesel prices reported by region, as of May 4, were:
- East Coast: $5.50
- Midwest: $5.74
- Gulf Coast: $5.18
- Rocky Mountain: $5.51
- West Coast: $6.63
Regional Diesel Prices: 4th Week of April
The average price of a gallon of diesel decreased again this week, with the national average price dropping by 5.2 cents.
Work Truck | EIA
Average diesel prices reported by region, as of April 27, were:
- East Coast: $5.42
- Midwest: $5.13
- Gulf Coast: $5.01
- Rocky Mountain: $5.27
- West Coast: $6.53
Regional Diesel Prices: 3rd Week of April
The average price of a gallon of diesel decreased again this week, more significantly than a week ago.
Work Truck | EIA
Average diesel prices reported by region, as of April 20, were:
- East Coast: $5.49
- Midwest: $5.16
- Gulf Coast: $5.07
- Rocky Mountain: $5.21
- West Coast: $6.62
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