This isn't the first time we've heard that Toyota might spin off the Prius as a separate brand much like Scion. But we now have the most concrete news about the automaker's plans we've seen yet.

A number of factors are conspiring to create a situation that recently would have been unthinkable: the United States as a supplier of gasoline to world markets. According to Booz & Company, those factors are the rise of biofuels in the West, the introduction of plug-in electric and other alternative fuel vehicles, and the growth of the really cheap car, like the Tata Nano.

Hydrogen has been touted as a viable fuel source for decades, and seemingly every day, some new or upcoming hydrogen-powered milestone is reached or discussed. However, in nearly every case, hydrogen is being touted as a standalone fuel source. But what about using pure hydrogen mixed with gasoline to increase fuel economy and reduce emissions?