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*Apr. 26, 2021-May. 2, 20217.75%April 19, 2021Apr. 19, 2021-Apr. 25, 20217.75%April 12, 2021 *There is a lag between the fuel price index and.