Originally Posted by Schneegz
That sounds great, and it brings up yet another topic of discussion. Ethanol. E85 (85% ethanol, 15% gasoline, for those who don't already know) is even cleaner than gasoline, and although more expensive to produce right now, production technology is improving. Furthermore, it has an octane rating of over 100, which makes high-compression applications, such as HCCI, much easier to manage (just as Diesel does).
However, there is one
BIG downside to ethanol--the fuel efficiency is quite a bit lower than gasoline, because you have to burn more fuel for the same power output. This is why E85 isn't such a good idea.