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Your results can never be accurate because of the fact that you did not fill up at the same station twice. That is why acetone is so difficult to nail down. There's just too many variables in the gas station tanks and where the fuel is processed from. I've been playing with the stuff about two years now and always, always get varied results. I filled up one time at a shell in a different town, spiked the gas and actually LOST 2 MPG's! I do, however, believe that your driving habits greatly influenced your mileage over your buddies. BTW, I admire your vigilance in getting some logged results! If you refer to page one of this thread, you'll see my history of tests.
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