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*Aug. 31, 2020–Sep. 6, 20205.75%Aug. 24, 2020Aug. 24, 2020–Aug. 30, 20205.75%Aug. 17, 2020 *There is a lag between the fuel price index and.