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The P3 gauge (available for some of the BMW models) shows, amongst other things, actual speed. The car's gauge is very optimistic.
When I'd finished with the oem tires on our 135i, I upgraded a little in size (215/245 stock to 225/255, with same sidewall ratio) and have decreased the optimistic speedo / odo readings, as compared with my Garmin. I will be doing the same with my 1M when its stock tires are done this coming summer.
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Richard
2013 BMW M3 Individual -- Fire Orange (sold)
2013 BMW X1 xDrive35i M-Sport -- Valencia Orange (sold)
2011 BMW 1-series M Coupe (#205/220) -- Valencia Orange (sold)
2009 BMW 135i M-Sport Coupe -- Space Grey (sold)
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