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Originally Posted by aladdinAndMagicBmw
Thank you for your continuous nice answers.
Is there any other benefit except looking from having different sizes front and back?
and how much is gas mileage difference between running 18" and 19"? Specially concerning 328xi's worst gas mileage among 3 series, does it show visible difference?
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There is really no other benefit. Some say that it improves handling but I don't think it would be that noticeable. If you drive the car hard, it may introduce a bit of understeer.
I moved from 16" to 18" and haven't noticed any adverse affects on gas mileage. Moving from run-flat tires to non-runflat tires will actually improve gas mileage as they weigh significantly less (28 pounds compared to 22) and greatly reduce unsprung weight. You'll notice an increase in acceleration as a result as well.