May 2, 2017 May 2, 2017 / By Blase Iorio / Fuel Pricing/ diesel fuel prices • U.S. Regional Pricing/ 0 Comments Diesel Fuel Prices The Average U.S. On-Highway Diesel Fuel Price on May 1st, 2017 was $2.583. The price has been inching downward for the past 4 weeks. The Gulf Coast Region remains the lowest at $2.435, and California is still the highest at $2.937.