Quote:
Originally Posted by champignon
Get out your smartphone and install one of those gps-based speedometer apps, or use a Garmin GPS, or do both, then compare the speedo reading to the true reading on you GPS device or smartphone. Do this several times to be sure you don't have an errant GPS-error reading. Also, when you pass through one of those "courtesy" radar things telling you to slow down, look at the mph or kph that the device shows you vs. what is on your speedo.
Unless the M2 is a wholly different animal than any BMW I have knowledge of made in the last 10 or 15 years, your BMW speedo will read several to as much as 6-7 mph higher than your actual speed, depending on how fast you are going. Try it.
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A week ago or so, I drove down a street with a speed sensor reading. I was not going that fast but I noticed it was off a few mph faster than my speedometer. Didn’t think much of it but maybe this is true!