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*Mar. 29, 2021-Apr. 4, 20218.00%Mar. 22, 2021Mar. 22, 2021-Mar. 28, 20218.00%Mar. 15, 2021 *There is a lag between the fuel price index and.