i run 4:56 in my dart with a 29" tall tire. not to bad at all. obviously your not going to cruise at 80 but she has no problem rolling 55-60 for long periods. wouldn't try it with a short tire, but them tall one's really cut into the gear. i use to run a 3.91 with a 26" on my belvedere. wasn't much different from how the dart is with the tall tire.