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*Dec. 20, 2021–Dec. 26, 202112.00%Dec. 13, 2021Dec. 13, 2021–Dec. 19, 202112.00%Dec. 6, 2021 *There is a lag between the fuel price index and.