The annually ethanol production in USA, in 2009 was 10.6 billion gallons of ethanol (40.1 million litres; as a consequence the country reduced the oil imported amount for that year by 364 million barrels at saved $21.3 billion! Furthermore America’s ethanol producers provided benefits to the nation’s Gross Domestic Product (GDP), adding $53.3 billion dollars. This economic impact and the 400,000 job creation in all sectors of the economy raised the individual household incomes by $16 billion dollars. The combination of increased GDP and higher household income generated an estimated $8.4 billion in tax revenue for the Federal government and nearly $7.5 billion of additional tax revenue for State and Local governments. The estimated cost of the two major Federal incentives in 2009, the Volumetric Ethanol Excise Tax Credit (VEETC) and ethanol Small Producer Credit, totaled $5.0 billion. Consequently, the ethanol industry generated a surplus of $3.4 billion for the Federal treasury. (htt)

All auto manufacturers approve the use of blends of 10% ethanol or less in their gasoline vehicles. However, vehicles will typically go 3–4% fewer miles per litre on E10 than on straight gasoline. More than two thousand filling stations in the U.S. sell E85, and that number is increasing rapidly. The main disadvantages of the E85 are the following: can only be used in flex-fuel vehicles, has a lower energy content, resulting in fewer miles per gallon, has a limited availability and currently is expensive to produce; whereas the advantages are: it is a product that can be domestically produced, reducing use of imported petroleum, has lower emissions of air pollutants, is more resistant to engine knock and the cost for the added vehicle is very small. (htt1)

Source : http://ethanolrfa.org/page/-/objects/pdf/outlook/RFAoutlook2010_fin.pdf?nocdn=1.