Home/American Shipper/Diesel to average $3.87 in 2013 American Shipper Diesel to average $3.87 in 2013 FreightWaves Staff · Thursday, January 10, 2013 The average price of diesel will fall to $3.87 per gallon this year, a price drop of 10 cents compared to the average cost of diesel fuel in 2012, according to the U.S. Energy Information Administration.