This article:

http://www.msnbc.msn.com/id/5829046/

Says 20% of new cars sold are flex-fuel. They'll run on gas, ethanol, or any combination thereof.

That article is old. It's quite higher now - more than 70% of all cars sold are FFVs.

This is just one reference: http://tinyurl.com/24npew

Luis - congrats on the fantastic and very fascinating write up.