you are right about that. other parts of the plants can also be used as feedstock, even biomass.
Take corn for example, the other parts of the plant apart from the grain are not as high in starch and thus would not be an economical option in the case of large scale production. although research is being done to device how to convert cellulose (which those other parts are mainly made of) to ethanol.
you can read more here
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Thanks for the response. I'm sure it will soon be a reality and also a great breakthrough to convert cellulose.