As of yet there is no calibration for tire size. But this is something there working on and should be available in the near future. This modification could be installed through updating the unit from your computer.

So just so I understand correctly; can you feel a noticeable difference in power? Did your economy go up or down?

It is so hard to be able to judge car's performance buy the seat of your pants..But if i would guess I would say it is a noticeable difference in better acceleration. I haven't checked to see if MPG are any different..

Ya I can understand that. But usually if the power increase is pretty decent, you'll def. feel it. YOu should monitor your mileage and report back; I'm curious to know if it altered any.

any update about the superchips tire size question?

Or mpg improvements?

Was hoping to get superchips for my 2010 Alpha, but they don't cover mine.

Didn't know there was that big of a difference between the 09 and the 10...

I thought I heard it was because the '10 model was a E85 engine. Superchips can't be used with that. This is what I heard anyway. I would still like to know if it does anything for mpg's though.:confused:

I just ran mine through a tank of gas in my 08 Alpha......with 89 Tune there was a big difference in performance and I gained over 3 MPG! I am running 35' Trail Grappler's and had a standard 12 MPG AVG.....tank with tune yielded 15 MPG and I was on back roads the entire trip. I tried the Economy setting for mileage but it had the power of an I5 so it was removed quickly.

Nice fuel econ gains!

Curious about the Dealership issue of voiding the warranty if you use a super chips tuner -I know you can put the stock tune back, but someone mentioned the dealership can tell from the diagnostics they run and will void the warranty... How true is this?