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So would setting the programmer to "regular" and still putting in 93, would that get me better gas mileage?
So on a long thousand mile trip, would the horsepower decreae and the mileage increase?
Your best bet is to contact Superchips and find out exactly what each setting actually changes in the stock program. From what I've heard from several local tuners, the handheld programmers only change timing. Therefore you'd get a little more timing advance on their "premium" tune and less timing advance from the low octane tune. Hope this helps...