I like cars too. I have been on this site for awhile. The site does not promote street racing.
I am sorry but I think the dealer has a point about a test drive. There are other ways to check this.
Also, no one answered the question, but does the warranty cover racing even if it is legal?
People can die in crashes at 15 miles per hour. But generally it is speed that kills. A salesman in Louisville last year encouraged a potential customer to test drive it fast. (A Charger I believe.) He hit a woman head on and killed her. The potential customer and the salesman all faced criminal charges. So yes, a quick jaunt to 80 can kill.
I have a Mustang GT and I drive the speed limit.
Sorry if that hurts anyone's feelings. Speed kills. So do stupid drivers. So do people who drink.
All of this is my opinion. You don't have to like it.
I still think the dealer had a legitimate point about a TEST DRIVE at 80.