That's completely impossible in this country. Notice that there wasn't a single pothole, seam, tar strip, or bit of loose gravel on the road? I can't find that sort of pavement anywhere (plus it's all downhill). My car could get GREAT mileage on roads like that.
In this guy's case, I think cD stands for 'cranial deficiency'. Like so many extreme sports, it looks like extreme fun matched with mortal stupidity. I'm not so sure I wouldn't love to try it though. The problem is that I'd want to keep trying it.