ok i checked my MPG today and was kinda surprised my truck has a 3'' dp just dumped behind the cab, 6637 intake, stage II's, dp tuner chip and it's also a 5spd with 3.55 gears and i run a 305/70/r16. i went to the same pump i went to last time i got diesel and i had drove 160 miles and it took 8 gallons to fill up the truck so i got 20 mpg. i was surprised with the stage II's i don't drive it that hard but it smokes a lot when i go up hills or acclerate without downshifting at less than 1500 rpms.

 

I had been averaging 22 mpg in my 97 F250 2wd till my fuel pump started leaking, now with the leak i'm getting about 20 mpg. I have a 3in DP, gutted cat, no muffler, and 4in exhaust, otherwise completely stock. It's a 5 speed with 3.55s and 344,000 miles

 

mines 4x4 with stage II's i was expecting like 16mpg

 

dang, i'm jealous! my fuel leak seems to have pulled me down to around 13-14 mpg. i've never had her do better than 16-17 though...my goal is to get her in the 20s, w/o 6500 lbs of horses and trailer anyways. right now most stuff is *still* stock, but i'm trying not to slack off on simple stuff like oil/air/fuel filter changes...maybe there is more i should be doin??

 

dont rule out less mileage yet, half tank isnt really accurate, run both tanks down and refill, see what it averages out to

 

katie, your truck is identical to mine in size and build, with my mods i get 17-18 on avg and cruises at 50-55 yields 19.9

 

it might be a while before i try to fill both tanks work isn't gonna like if i turn in a $100 fuel ticket i do go at getting $30 dollars every few weeks

 

ARK, I have the same truck as you for the most part. The last time I checked mine (pre-H2e) I went from 18.6 to 17.1 after I installed the stage II's. That is Interstate driving from 65-70 mph. I also have 4.10 gears so your 20 sounds right on the money.

Now go and drive it hard and see what mileage you get. I am afraid to. LOL

 

I checked my new to me truck Saterday and got 17.65 on the highway.

 

I get about 20 on the highway at 65mph, thats with 4.10's any faster than 65 mph i get 15 or less.