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Originally Posted by BoxsterLewis
I just did the calculation and its like $3.20 to put 93 verse 87 a tank extra. thats roughly 80-100 bucks a year, most you guys make that in a few hours 
Go with 93 octane  |
That $80-100 is assuming you get the same mileage with either octane level. You don't. Mileage is typically better with higher octane fuel (in a car that's meant to use it). So it's actually even less savings than that.