excursion gas mileage
#3
RE: excursion gas mileage
My brother has the superchips tuner on his 03 X - previous post is pretty much correct. to gain any mpg you have to run the highest tune seting and that requires you run premium.He did it for 2 tanks and got about 1.7 mpg gain.....not enough to cover the added expense of the premium fuel.
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