Grain isn't a limited resource

Grain isn't a limited resource. We can grow tons more. Right now, the government pays farmers NOT to plant crops. But wait! There's more!
Most corn grown in America is feed grain for cattle. In the ethanol distilling process, only the starch is used. All the protein fiber and oil is left over for use as cattle feed.
But wait! There's more! There's no need to limit ethanol production to corn. There are other sources of ethanol including sugar cane (Brazil is running their cars on sugar-cane based ethanol) and other sugar-bearing crops. Plus, there's cellulosic ethanol, the next coming technology.
But wait! There's more! There's no need to limit our automotive fuels to ethanol. We can run our cars on METHANOL which can be made from darn near anything including coal, waste wood, waste paper, and even garbage.
Diesel powered vehicles can be run from dimethyl ether, another alcohol derivative.
In the third world where economies are agrarian in nature, growing plants for automotive fuel holds the potential for economic growth that these countries so desperately need. Why let the poor countries get raped by OPEC when we can have THEM make our automotive fuels.
Yet if you read my post, you'll note that we don't have to do anything to MAKE ethanol. We merely have to make our vehicles CAPABLE of running on alcohol fuels. By doing that, we can place a cap on the price of petroleum that will limit OPEC's ability to control prices.
We can't lose if we have motor vehicles capable of running on biofuels. The possibilities are endless. We can even derive bio-fuels from algae fed from CO2 emissions from power plants that we are currently throwing away. Even the tree-huggers will like that one!