I figure that was about the speed the truck was going, given how he gained such incredible ground on me instantly, and was almost catching air off the quite smooth roadway. I've ridden next to 65mph traffic, (12 feet away, riding the shoulder of loop 360) and tonight, this legitimately looked like he gained ground twice as fast.
Luckily I was cycling in this 'odd' contraflow bike lane that puts NB cyclists on the other side of the road from NB cars. This is a neighborhood street with a 30mph speed limit. It is dead flat and straight for over a mile, so I think it attracts this sort of 'testing the limits' of your vehicle driving. Most likely a teenager, as I remember how my friends drove when we all first started driving.
Well, yeah it was like being in a video game. The even stupider part is that a few hundred feet away is a 6 lane expressway that parallels this road. If you're going to drive that fast, at least do it on the highway.