When making alcohol from corn. For every one unit of power put in you get 1 unit out. A 1:1 conversion rate which is renewable but unviable, un economic, un ethicl, unsustainable.... Just about un everything. When using sugar cane for every 1 unit in, you get 8 out. A conversion rate of 8:1. Which is renewable, sustainable, economically viable etc.etc .... every thing that corn isn't .......... The only way the corn to alcohol industry survives in the USA is government subsidies & grants. The corn growers are laughing .... as are the rich pigs getting the grants & subsidies. If every sewerage plant had an Algy farm attached to it we would have more oil than you can poke a stick at.