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*Jan. 25, 2021–Jan. 31, 20216.50%Jan. 18, 2021Jan. 18, 2021–Jan. 24, 20216.50%Jan. 11, 2021 *There is a lag between the fuel price index and.