Maybe he already applied for the patent, just waiting for it to go through. I would say it is possible, we have come a long ways in the last century. Their are alot of things now days that are possible that no one ever though could be possible 20 years ago. If I were him I would watch my back, their is probably a big red bullseye on it now!
It says he's waiting for patents, and he also said 500mpg might be possible!!!
http://www.nbc6.net/news/16767930/detail.html