According to the 1998 Ford Expedition Owner Guide :
( " regular " unleaded , 87 octane is used )
The Ford Expedition's where first built in 1997- Present. It depend on the year and model too. My Old 1998 Ford Expedition XLT had a 30 Gallon Gas Tank.
" regular " unleaded , 87 octane
" regular " unleaded , 87 octane
The 2007 Ford Expedition is a gas-powered vehicle.
The 2004 Ford Expedition is a gas-powered vehicle.
The 2005 Ford Expedition is a gas-powered vehicle.
The 2008 Ford Expedition is a gas-powered vehicle.
The 2002 Ford Expedition is a gas-powered vehicle.
The 2006 Ford Expedition is a gas-powered vehicle.
The 2003 Ford Expedition is a gas-powered vehicle.
The 2001 Ford Expedition is a gas-powered vehicle.
According to the 1998 Ford Expedition Owners Guide you use regular unleaded gas with an octane rating of ( 87 ) and up to ( 10 % ) ethanol so it does not have flex fuel engines ( As far as I know if you could use E85 the mileage would be worse )