my first tank on my BMW was 87 octane, I was just out of habit from my other car, sure it ran fine and all but the milage wasn't what it could have been.
From the second tank on out I went to the recommended 89 and I noticed great gas milage on a 220 mile trip to school I got 35 -37 MPG
Last time I went home I stopped at a gas station, and guess what they were out of 89 so I wasn't going to put in 87 and I wasn't going to a different station, so I put in 93.
The results of 93 from the 220mile trip home are 39 - 39.5 MPG
From this point out I am running premium only, what is another $2.00 at fillup when you make it up in milage.
I am not one to complain about gas prices and probably never will because I look at the alternatives. | 
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