Quote Originally Posted by blujfan9293 View Post
I then remembered the adjustment I had to do with my Trooper and oversized tires, and sure enough--each mile marker I was only clocking 9/10 mile, so that improved my mileage. (though don't know if I am going faste or slower than speedometer reading...)
If your odo is registering less miles than actual, then your speedo is registering less than actual too.

If your margin of error is 10%, 60 mph registered = 66 mph actual.