I am having the same issues. At an indicated 70 mph it feels like you're driving in reverse because everyone else is blowing by you. Anyway, I took the car in yesterday for the tire issue, a warranty item, and some recalls. I asked them about the speedometer issue but this particular dealership was unaware of a fix. Here is the propaganda sheet from BMW addressing the speedo error. Evidently a "10% + 2.4 mph variance is acceptable on a high end luxury vehicle. I'm not a betting man, but I would place a healthy wager that my pickup truck doesn't have a speedo variance anywhere near the "allowable" threshold for BMW. I had the software updates done and it didn't seem to fix the speedo problem.
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