So let's put this into real numbers, if you drive 12K miles/year and get an avg of 23mpg you'd save $11/month by using regular vs premium if you assume that premium is $.25 more per gallon.
If you can't afford $11/month you shouldn't be driving a BMW. That why every gas thread drives me nuts on here. An extra MPG or a few cents at the pump has little to no real effect on your wallet.
Just put in good gas and drive it like it was meant to be driven.
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