Dont forget to multiple the mileage by 1.016 to get actual mileage. Thats the difference in the speedo and actual mph\mileage.
So, would 215's give a smoother ride than stock 205's?? I'm looking for any and every way to accentuate smoothness & quietness. To be fair, I was so impressed at the refinement of my new '08 5 for the price, but want to make sure I reinforce that in any way I can.