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. 4, 2021–Jan. 10, 20216.25%Dec. 28, 2020Dec. 28, 2020–Jan. 3, 20216.25%Dec. 21, 2020 *There is a lag between the fuel price index and.