its hard to find...the sugar cane based eth is better than corn based. most of the eth we use in the states is corn based ...which actually costs a lot more to produce compared to sugar cane based eth. thats why brazil uses sugar cane eth ....they have lots more suger cane than corn...and its easier to produce the actual eth.
there was a thing on either the discovery or history channel aboot the producing of eth. very informative ..