K9JRF
Member
I have a 02 XLT with 5.4 and 100% highway, 25.9 gallons to fill up (gas light activated) got me 349.7 miles before gas light came on again. which is roughly 13mpg. That's at 65-70mph.
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If you want more mpg, u can make the gap smaller on your spark plugs. But u will be sacrificing power and hesitation and cel will definitely be on at high end. I don't recommend it, but when my spark plugs were not gapped right, I got good mpg of 15.5 on highway but car ran like it had a 4 cylinder it really wasn't smooth
How much gas your Expedition use?