four wheeler got that mileage with a 4x4 with a little offroading. ours is a 2wd. i was expecting high than that because half of the miles are highway. what mileage is everyone else getting.

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1999 Expedition XLT 2wd
330 V8

 

99,XLT,4X4,3.73LS, and 5.4L motor,12-13 streets and 13-16 on highway depending on load and foot pressure on pedal.

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99 Expedition XLT
5.4L
4X4
3.73LS
17"AT/S
Airaid Intake
Superchip
Custom Edlebrock shocks
Dynomax Super Turbo 3"
Helwig Sway Arm
Polk speakers

 

I am getting between 13.5 and 14 with about 50/50 driving. On the highway cruising at about 70 I get around 16. I have noticed that if I stay under 2000rpm the milage is a little better.

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98 EB 4X4 all stock except for Flow Master exhuast.