Well anything you can do to help the engine breath easier should give you increased efficiency, which means more MPG's. Problem is with more power on tap it is very hard to resist using it. One the nostalgia of the extra power worn off you will start to see an increase in mileage.
I will have to let someone with more experience with the gassers to help you as far as programming goes. If its anything like our oil burners, custom tune are FAR superior in all ways.
Good Luck
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