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Originally Posted by FMZ
Got 31.13 MPG this time, got 9.099 Gallons of gas (93 Octane) and went 283.3 miles before getting gas. I will stick to 93 octane from now on since there's no cost difference between 91 and 93. Also I drove it hard this time  and I am surprised I got that good of a mileage out of tank.  I would say 90% of it was highway. |
You are figuring the MPG wrong. You need to fill-up, drive it (at least 100+ miles), write down how far you went, fill-up again, then divide how far you went by the last fill-up (not the first). And do this 3 or more times to get a better estimate.