Off-Highway Diesel Prices Details Published: Tuesday, 24 September 2013 13:42 Written by Rock Products News The national estimated average price-per-gallon for off-highway diesel fuel as of Sept. 23 is $3.674. That is lower than the previous comparison price-per-gallon of $3.715. Related Articles Off-Highway Diesel Fuel... Off-Highway Diesel Fuel... Off-Highway Diesel Fuel ... Off-Highway Diesel Fuel ... Off-Highway Diesel Fuel... Off-Highway Diesel Fuel...