Depends on what you mean by “large scale.” The US consumes something like 900 trillion Btus of ethanol, the largest consumer in the world. That is a tiny, tiny, tiny proportion of the 95 quadrillion Btus of total energy consumption in the US. http://www.eia.gov/totalenergy/data/annual/pecss_diagram.cfm
The United States, consuming approximately 719,930 barrels per day, is the world leader in ethanol usage. Brazil is relatively close at 393,300, but there’s a precipitous drop-off after those two. As rigibson said, ethanol consumption may seem somewhat significant when looking at the numbers without context, but in reality, it pales in comparison to many other fuels.
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