Within the 5 greatest TESTED 'greens' for generating ethanol and ranking from hi-to low, getting the most Bang for The Buck, corn ranks fourth. Wood Pulp, is 5th.

It has to do with the available 'plant sugar', and ease to 'digest' it into a liquid, alcohol. Also, The amount of 'fossil fuel' energy it takes to squeeze out what alchol is there.
Switch Grass ranks #2, cane sugar is #1.
Its elephant Grass and is renewable upto, two crops a year.
It can be grown virtually anywhere with in the U.S. Oklahoma to Kentucky,the low flat grassy plains within the Mid-west is Prime. Dosnt need the care and patience, pesticides nor the water, corn crop takes to get just 1 crop a year.
Its a 12-15 foot Grass, would be the Largest Yard in the United States, and Tallest.

And, here The Eggheads in D.C. pick THE 2nd TO LOWEST IN PLANT SUGAR......CORN....... and MOST COSTLY to process into ethanol...not only driving our food cost out the roof, but making MILLION AIRES OUT OF A SELECT FEW, CORPORATE CORN GROWERS.

Think about that and DEMAND your elected officials to act in getting the upside down thought process in D.C., geared to The American People and NOT to the friends and cronies, GROUPIES, hanging around the Money trough, designed and contrived up by the theives within our Governement.