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*Sept. 28, 2020–Oct. 4, 20205.75%Sep. 21, 2020Sept. 21, 2020–Sept. 27, 20205.75%Sep. 14, 2020 *There is a lag between the fuel price index and.