[razorback-bert]

Theoretically, the maximum conversion efficiency of glucose to ethanol is 51 percent on a weight basis. However, some glucose is used by the yeast for the production of cell mass and for metabolic products other than ethanol. In practice, between 40 and 48 percent of glucose is converted to ethanol. With a 45-percent fermentation efficiency, 1,000 kilograms of fermentable sugar produce about 570 liters of pure ethanol. Conversely, about 1,800 kilograms of fermentable sugar are required to produce 1,000 liters of ethanol. Mash typically contains between 50 and 100 grams of ethanol per liter (5 to 10 percent weight per volume) when fermentation is complete

See more here

[balrog666]

With a 45-percent fermentation efficiency, 1,000 kilograms of fermentable sugar produce about 570 liters of pure ethanol.

No, it produces thousands of liters of messy, smelly mash which, if adequately refined, may yield some 570 liters of ethanol. The problem is that the refinement takes a great deal of energy and the more pure you want it, the more it costs.