I've been using 93 octane tune and just turned it down to 91 almost 2 weeks ago. For gas mileage and power 91 is best of both worlds. Before with 93 i'd have to fill up almost every week, give or take a few days. Ever since i switched to 91 on my last fill up close to a week and half to 2 weeks ago i'm now down to a quarter of a tank and have gone close to 300 miles on this tank. I haven't changed my driving habits at all. Where as before, i'd reach about 270-280 miles before i'd have to fill up.
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