Compression Ignition Addict
Join Date: Nov 2011
Location: Pacifica, Ca
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I have a 5.5 inch lift and 35s. After reading the correct mileage driven (GPS) I was averaging 10.6mpg exactly (only city driving). I ordered a custom tuned TS chip tuned by TW and no joke. I saw a 2mpg increase. Granted I am a pretty sensible driver. But after I installed the chip I saw 12.4 mpg every tank on my DD tune.
But like Jesilvas said, you are actually traveling further then your speedo says. When I'm doing 50 on my speedo, it comes out to 54. When I'm doing 60 I'm actually doing 65. The way I see it, for every ten miles per hour, I'm doing 1mph less. So if its in the 50s, I'm doing 4mph faster then registered, in the 60s I'm doing 5mph faster, and in the 70s I'm doing 6mph faster.
Sorry if I'm not making perfect sense, but I hope you get the idea. Before my chip, running my 5.5 inch lift and 35 a/t's was getting 10.6mpg. Once I got my chip and i drove reasonably and sensibly, I am now getting 12.4-13.1mpg per tank (DD and Street Tune). Hopefully this helps. If not, I'm sorry lol. But when i was running no chip and the current set up I have, I was averaging 10.6mpg per tank (city driving only), so for the lift and tires you're running, that sounds about normal
2006 F250 Fummins with Allison Transmission
Fully loaded with all the goodies
Planning: Carli 4.5" Backcountry with full deaver upgrade