National average diesel fuel prices were $3.38 per gallon as of September 20, 2021, according to the U.S. Energy Information Administration.
This is an increase from the beginning of the month when diesel fuel prices were $3.37 as of Sept. 6.
At the end of August, diesel fuel prices were $3.34.
Current average diesel prices by region are:
East Coast: $3.35
Gulf Coast: $3.11
Rocky Mountain: $3.62
West Coast: $4.02
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