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Originally Posted by guruerror
Still waiting on the 4.56s to arrive, but I moved forward with the reprogram using the Superchip Cortex 2950.
I selected a performance tune and programmed in new tire size. NICE results! Based upon my typical city/highway driving to and from work yesterday and today I'm back up to 12.0 mpg and the truck's acutally got some pep in its step.
I haven't felt an automatic shift like that since I put a shift kit in my '70 Fastback years ago. The new shift points are awesome...really starting to get the power back to the wheels. I think the gears will be the icing on the cake.
I guess I'm just impressed that a 'tune' could make such an improvement.
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Drive the truck for a week like normal and tell us that you averaged 12 mpg.
I'm betting not.
A performance tune will usually drop your mileage roughly 2 mpg. If you're averaging 12 mpg, you either a) are babying it or b) don't have enough driving to collect good data.
Typically bigger tires will give you 9 mpg. Installing gears will usually bring it up 2 mpg. A performance tune won't do that.
Drive a few weeks and let us know.
Mark