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I would start at the bottom of the tune choices and drive it for a week or so, then bump up to the next level and do the same. Write a few reminder notes along the way and once you have tried them all pick what fits your everyday driving style the better.

But then is just my train of thought.
 

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Good point. I have found for me that the performance tune nets me better MPG than the economy tune. I live in a hilly area and I think having more HP help with the hills which then helps with the MPG
Same here, just as some programs adjust the shift points, the 97 performance firms up the shift, where as a custom tune on 97 may be too firm for everyday driving and traffic situations. The economy tunes keep the boost level low and more short or early shifts on the transmission to keep RPMs down, where a performance tune will run the RPM higher before shifting and allows more turbo boost early on, which in many cases will improve the over all MPG under certain driving conditions or driver style.

A tune will do just that to the computer, set a new tune of perimeters, but your right foot will be the true application of how the tune gets used.
 
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