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Originally Posted by FirstBMW
I have the 3.0 SI and get about 12/13 city and 17/18 highway, not very good really. I generally use 89 octane. (car has 3400 miles). I have not tried 91 octance for an extended period, that may help a bit, but don't think it is really worth the increase in cost. The car runs fine on 89.
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I have actually found out that the increased fuel economy i get with premium MORE than pays for the price difference.
Also, I suspect these fuel economy numbers will increases once the car has several thousand miles on it.
In addition, I actually find the new EPA ratings to be too low. The combined mileage on my 330 under the new ratings is 20 MPG, but I actually get 24 MPG.