[ProjectM96]

I don't believe GPS' are accurate. If they are, then that means most cars are exactly -2mph off.

My GPS shows 2mph faster than every single car I have used it in. Always 2mph faster whether its in a Honda, Mazda, Nissan, my Porsche, or a Chevy Tahoe.

I get the same result with my fathers GPS and my GF's GPS. Always 2mph faster reading no matter what the car. I tried it with Garmin and Tom Tom and my dad's Android phone.