I just bought my new 5.0 and my car tells me hat my speed is limited to 80, is that because of the fact that its a new engine? Or maybe because the dealer said it was built for 87 octane.
The dealer lied to you. While you are stopped, use the three buttons under your headlight switch to get to the system info screen (should hit the middle one once). It will tell you towards the end of the car status how many administrator and/or mykeys you have. If you have any mykeys, make them admin keys. Unless of course you feel the need to control yourself.
There are 10 types of people in the world. Those who understand binary, and those who do not.
Are you saying the car won't accelerate above 80mph? Did you buy from dealer stock or did you order yours? If it was from dealer stock the dealer may have set a top speed limit to keep test drivers from really opening it up. If you check your manual I believe there is a way to set the top speed, a sort of parental control setting. Check it out and see if that is what is causing it.