btw, even with custom tuning and every bolt-on in the world...we are only talking about maybe a 1 mpg gain. nothing world changing. The Expedition is just too heavy.

conversely, with my Mustang and similar mods, I could see gains of up to 3 MPG and 30-40 HP.

but it also wieghs 1/2 the weight of the Expy, with almost identical HP/TQ values