Duuuuude, me and my old roommate used to do just that about 10 times a week! It's super fast......we both had speedometers and we would usually average 48mph with top speeds of 55-57. Once when the conditions were perfect we got up to 63.......believe me if you want but I know what I saw on our read-outs. btw.....we calibrated the odometers while holding onto cars......
Sonoma, California, United States 
