I have a ford excursion limited w/the v10 and love it.I recently put an eight inch lift w/38s,I leave the overdrive off and I still have the power to pull long hills,the gas mileage hasnt seemed to change so far,but I will keep you all up to date.

 

A WHAT lift? You can' t post something like that without a picture.

Did you realibrate with a chip with those huge tires? That has got to be a sight!