Hello wjkrolcoxnet-- The 1999 Ford Expidition has estimated gas mileage of 13-18 for a two-wheel-drive and 12-16 for an All-wheel-drive. Did you know that you can find this information for any car at the government's own site http://www.fueleconomy.gov/? Good luck from Bovan.
Search Ford Expedition Questions
Ford Expedition Experts