Improved performance and gas mileage for an '07 4.2 9-7x
Bought an '07 4.2 9-7x a while ago as a move up from a standard '06 Trailblazer.
Am familiar with the performance and mileage of that vehicle, and I'm wondering what can be done to improve either...or better yet, both.
Thanks for any help, I (and my wallet) appreciate it!
Were you able to make adjustments and improvement?
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