The fuel surcharge percentage for FedEx Freight® services is based on the weekly published national U.S. on-highway average price for a gallon of diesel fuel. FedEx GroundFuel Surcharge Rates Effective DateFedEx GroundSurchargeBased on Weekly Fuel Price Reported for*July. 26, 2021-Aug. 1, 20219.25%July 19, 2021July. 19, 2021-July. 25, 20219.25%July 12, 2021 *There is a lag between the fuel price index and.