20+mpg?
 

I've seen on diff online sites of guys getting 18mpg in town and 20+ highway with a 4x4 6speed with tuner intake and exhaust.... is there any truth to this? Has anybody gotten these numbers before?

Its been done, best I ever got was 17

3.55 gearing, 35" tires, and a baby right foot and I pulled an avg 23 out of my truck a decent bit.
Also can drive it and get 12.
It can be done
But it's also not a 7.3

I've gotten 20 on highway, unloaded, but I'm auto and 2wd

I just bought my 7.3 its a bone stock 4x4 with an auto trans and i get 15 mph avg

on average. I get 15 to 16 on highway. in town i get 13 to 14. I have a auto 4x4 with intake and exhaust.

When i had a 1999 F-250 7.3 super-cab, long-bed 2WD, I was getting up to 15 mpg in the city & 18 mpg on the highway

Our intake/exhaust 7.3 gets 12 with a granny foot. I think the turbo is melted though. Heard of swapped fordcummins on propane that can get 25-30+ If I was a hotshoter that's what I would do.