Over the course of half a century owning cars, I've noted that some vehicles, notably those of German manufacture, have odometers that are spot on, while the speedo reads 3 mph fast. I have been told this is to insure that folks do not get speeding tickets unless they richly deserve them. Needless to say, fitting a different tire size in order to correct the speedo will cause the odo reading to be off. Perhaps this is an implementation of that ancient saw: you can't win.
So when we bought our newest Tow Vehicle, a BMW X5, I was annoyed but not surprised to see that indeed the owner's manual even mentioned that it was set to read 63 when actually doing 60. And sure enough, it does. Even though it was built in Spartanburg, SC, right here in the US of A.
