Guess I should be very SMUG with the fact my honda does 60 mph at 1700 or so rpms?
I find the speed of my sidekick isnt linear according to the odo. For example as I approach 45 mph it goes up to 5 mph off. As I approach 50 mph-60 its dead on, when I start to go to 70 its 5 mph faster. This is using a tomtom gps as a reference.
So, I slow to 40 in 45mph zones that have cops present, then go 5 over elsewhere.