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Originally Posted by 31_bandits
how about i add 3) my impression is that the engine runs smoother and my 5 best mileage tanks have been on premium, and 2 lowest mileage on regular, with alot of mixed mileage in the space between, generally implying that mileage is better on premium. Avg to date is about 5% better, avg cost for premium is about 3-4% more.
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What kind of driving were you doing when you got those best and worst mileage numbers for one tank? Average it out over a couple of months and you'll be sorely disappointed in yourself for wasting that money.