I've gone 100mph in my 89 Legend but the steering became unresponsive so I coasted to a better speed. And I did 120mph in my 93 Legend, the car felt like it could go more but my exit was coming fast and I had to get off. After that I didn't dare do it again for fear of a ticket. But all in all 170 seems a bit high but I don't know beacuse I didn't put the car to it's limits.