Just checked it up in the issue of our local car magazine where they tested the 320d with 16" wheels
According to equipment calibrated by our standards authority the speedo was underreading by 1.2%, well within the difference tires can make
You can also change your reading with your tire pressures, though not as much with the runflats, but it will still make a difference
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BMW if you are reading, I need a job, Please.
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