Well, guess I got lucky with my 5 then. Since day one the error has only been +2mph from about 25mph to any highway speed I've yet attempted (that's with a 40 series tire on a 19" rim). All verified by two different makes of smart phone and two different GPS speedometer apps. BTW it's not a "BMW thing" every make of car ever owned or driven has had this positive error built in, even before the overly strict speeding penalties came about.

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