BurbMan wrote:
The 8.1 has very predictable fuel mileage....you pretty much get 10 mpg no matter what, unless you tow at 70 mph, in which case it's around 8. I have gotten as high as 13 mpg cruising 55 mph with no head wind....
Also doesn't say what axle ratio, and not sure what the diameter of those 20" tires are vs. stock. Don't know why the trans was replaced, but these trucks are not known as "eaters".
LOL. Sure they are, our fleet numbers say they are as bad as anything out there for consuming transmissions. 4L80's (and variants) and their predecessors do not survive either heavy use or neglect.
