
Closing out May 2023, average diesel prices continued to decline across all regions heading into the summer months.
Photo: Work Truck/EIA
Heading into the final days of May 2023, national average retail diesel fuel prices dropped again to $3.86 per gallon, according to the U.S. Energy Information Administration (EIA).
This average price continued the downward trajectory for diesel prices over the past several weeks, with a just close to 3 cent per gallon drop compared with the previous week and around $1.68 less compared to last year.
The U.S.'s Rocky Mountain and West Coast regions continue to have average diesel prices above the $4 per gallon mark, but both area have seen consistently declining prices.
Check out Work Truck's latest weekly price diesel price update covering dipping and sliding diesel prices:
U.S. Regional Diesel Fuel Prices as of May 29, 2023
The final week of May 2023, average diesel prices as of May 22, by region are:
- East Coast: $3.89
- Midwest: $3.78
- Gulf Coast: $3.56
- Rocky Mountain: $4.07
- West Coast: $4.54
U.S. Regional Diesel Fuel Prices as of May 22, 2023

For the third week in a row, national average diesel prices stayed below $4 per gallon on average, but the Rocky Mountains and West Coast are still above the $4 mark.
Photo: Work Truck/EIA
Heading into the fourth week of May 2023, national average retail diesel fuel prices dropped to $3.88 per gallon. This average price dipped a smaller amount than in past weeks, just over 1 cent per gallon compared with the previous week and around $1.69 compared to last year.
Still, only the U.S.'s Rocky Mountain and West Coast regions have average diesel prices above the $4 per gallon mark, but the Rocky Mountain region is creeping up on that sub $4 per gallon price range with its average one-cent-per-week dips.
The fourth week of May 2023, average diesel prices as of May 22, by region are:
- East Coast: $3.91
- Midwest: $3.81
- Gulf Coast: $3.58
- Rocky Mountain: $4.09
- West Coast: $4.59
U.S. Regional Diesel Fuel Prices as of May 15, 2023

National average diesel prices have remained below $4 per gallon in the U.S. for two weeks in a row.
Photo: Work Truck/EIA
Heading into the third week of May 2023, national average retail diesel fuel prices dropped to $3.90 per gallon, according to the U.S. Energy Information Administration (EIA).
This average price dipped just over 2 cents per gallon compared with the previous week and $1.71 compared to last year.
National average diesel fuel prices during mid-May 2023 decreased in all regions week-over-week and year-over-year.
The national average price for diesel in the U.S. is $3.90, staying below the $4 per gallon mark for the second week in a row. The last time the U.S. saw this national average was February 2022.
Average diesel prices as of May 15, by region, are:
- East Coast: $3.93
- Midwest: $3.82
- Gulf Coast: $3.59
- Rocky Mountain: $4.09
- West Coast: $4.59
U.S. Regional Diesel Fuel Prices as of May 8, 2023

National average diesel prices dipped across all regions of the U.S. as of May 8, 2023.
Photo: Work Truck/EIA
Heading into the second week of May 2023, national average diesel fuel prices decreased weekly and year-over-year in all regions.
The national average price for diesel in the U.S. is $3.92, dropping below the $4 per gallon mark for the first time since February 2022.
Average diesel prices as of May 8, by region, are:
- East Coast: $3.99
- Midwest: $3.83
- Gulf Coast: $3.61
- Rocky Mountain: $4.11
- West Coast: $4.63
U.S. Regional Diesel Fuel Prices as of May 1, 2023

Diesel fuel prices have been on a downward dive for several months, with experts aniticipating it should continue for at least a little bit.
Photo: Work Truck/EIA
Starting May 2023, national average retail diesel fuel prices hit $4.02 per gallon, according to the U.S. Energy Information Administration (EIA).
This average price dipped just under 6 cents per gallon compared to last year's previous week and $1.49.
May 2023 started with week-over-week average diesel fuel price decreases in all regions except for the Rocky Mountains, which increased slightly by just over 2 cents per gallon.
Once again, all U.S. regions tracked by the EIA saw a price decrease for diesel fuel year-over-year.
These average prices are seeing a dip due to several factors, most notably the jump in domestic oil production and a drop in worldwide demand for crude.
According to a report from Reuters in February, "European buyers had increased purchases of Russian distillates ahead of the import ban that took effect on Feb. 4. A relatively warm winter across the United States and Europe and lower commercial trucking activity lowered demand.
Average diesel prices as of May 1, by region, are:
- East Coast: $4.07
- Midwest: $3.92
- Gulf Coast: $3.75
- Rocky Mountain: $4.15
- West Coast: $4.68
Looking at Average U.S. Gasoline Prices in May 2023
National average gasoline prices in the U.S. are primarily stable week-over-week, increasing less than 1 cent weekly. but they are on the rise week-over-week. The big news is looking at naitonal average year-over-year gasoline price dips, down about $1.05 cents compared to the previous year.
The midwest and Gulf Coast regions saw a minor rise in gasoline prices in Mid-May but overall all regions (except the West Coast) are staying below the $4 per gallon mark heading into the warmer months.
Average U.S. gasoline prices were $3.57 per gallon as of May 29, 2023.
Stay informed! Stay up-to-date on diesel fuel prices throughout the month by regularly checking for the latest updates. We will post new information as soon as it becomes available, so come back again!
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