Went on my test drive yesterday and the demo was also limited to 80. We were on the interstate and very quickly ran up to 80 where it stopped accelerating. I was told they don't like it but it seems to be the new standard with demo/loaners.
At the very first "Get Amped" test drive event a few people got more than a little crazy with the speed. The limiter was introduced for later test drive events and they've been doing that ever since.