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*June. 28, 2021-July. 4, 20219.25%June 21, 2021June. 21, 2021-June. 27, 20219.25%June 14, 2021 *There is a lag between the fuel price index and.