I think it is uncool that my computer doesn't compute any speed below 2 mph. There are plenty of times when I'm climbing and it says "zero". But I too have hit 30+ on some fireroads and boy, what a blast! A while back my friend was blasting down like that and a coyote jumped up and ran beside her for quite a ways. I think he thought she was chasing him!
BTW, I think fit guys can generally ride faster, so don't expect to catch up, expect him to wait for you like a good hubby.