The 35's were on there when i bought it. The speedometer is calibratered within 1-2mph (per gps) I do the math (not the overhead readout).Originally posted by Troutly
Your 35's will cut your mileage back. They are wider with a more aggresive tread pattern so they will have greater rolling resistance. Did you re-calibrate the speedometer after installing them?
I saw a consistent 17-19 MPG non-towing 55-70 MPH with both my 1999 and 2000 7.3's. It would also get 10-11 MPG towing down the freeway with up to 12K behind it. Made many a trip pulling boats, always got the same 10-11 MPG. Oh, and this was figured using real math, not trip computers
I really notice a drop on the highway after 55. If I keep it there, Ive seen 16.5. If I drive 70, it drops to 12.5. I dont get that. Maybe the turbo is going on something. I tow with overdrive off (Ive heard some people tow with it on ) and even if I drive around empty with the overdrive off, I only get 10 or so.
It doesnt make sense to me. If I didnt have the 35's on it, I would take it into the shop to see if something was wrong with it. Even with them I still wonder.
As far as pulling and running, it seems perfect.