This is why cops won't usually pull you over for doing just a few mph over the speed limit, they are aware that a speedo isn't exact
(but usually a mile or 2 over/under)
I'll have to agree with that one. You can have the dealer make sure that you speedometer is calibrated to the size wheels that you have (i.e. if you have the Limited, such as I do, it come with 19"wheels). That might correct the issue..Don't worry as the tires wear near the limit your speed will be almost exact. Due to the smaller dia.