Quote Originally Posted by Dave Severson View Post
Don't think you'd get enough return on the investment, if that's your concern.... but then that's not real unusual when playing with a truck anyhow....

the weight is the biggest hold back on the truck... Only thing I've ever got any kind of decent mileage out of in these behemoth trucks is a diesel. The diesels will really react to air flow improvements, bigger exhaust, and a chip... I've got a V-10 laying in the corner, someday going to build a light little car to put it in and see what happens....

Anyway, pulling around that much mass, a couple mpg improvement is probably about the best you could hope for... Changing all the lubes to synthetics would probably accomplish the same....

Mileage increase with syn lubes was a waste of $$. Mobil 1 - NADA, so am back to Motorcraft Semi Syn. ATF is whatever Ford uses. Differentials have a friction modifier that is compatible with the Ford Equalock/Traction Lock or whatever it's called.

Big mileage increases are not possible with this big of a truck and the less then spectacular aerodynamics - all I want is a consistent 10.5 to 11 town and 13-14 road. And the new Ford diesels, the 6.0 and 6.4 - their fuel mileage is not much better (1-2 mpg) then mine. With diesel fuel here over a dollar more per gallon, sure isn't worth it for a daily driver that seldom sees much bed or hauling load. Then there are the added maintenance costs (and warranty downtime) that really negate a diesel for the average joe. For a guy that regularly hauls a load though, the diesels are the way to go.