- , also frequently called '''gasohol''', is a Fuel mixture of 10% ethanol and 90% gasoline that can be used in the Internal Combustion Engine s of most modern Automobile s. The fuel has been mandated in the U.S. State of Minnesota since 1997 , though the state currently has a law that will mandate E20 fuel (20% ethanol) by 2013 .
- contains 15% ethanol and 85% gasoline. This is generally the greatest ratio of ethanol to gas that is recommended by auto manufacturers that sell vehicles in the United States , though it is possible that many vehicles can handle higher mixtures without trouble. Flexible-fuel Vehicle s are designed to take higher concentrations, generally up to 85% ethanol E85 .
- contains 20% ethanol and 80% gasoline. This fuel is not yet widely used in the United States , but will be mandated by the U.S. state of Minnesota by 2013. Since February 2006, this is the standard ethanol-gasoline mixture sold in Brazil , where concerns with the alcohol supply resulted in a drop in the ethanol percentage, previously at 25%.
- is a mixture of 85% ethanol and 15% gasoline, and is generally the highest ethanol fuel mixture found in the United States. It is common in Sweden , and there are more than 400 public E85 fuel pumps in the U.S. as of 2005 , mostly concentrated in the Midwest , with a large portion of those in Minnesota .
- contains just 5% gasoline and is used in some Diesel Engine s where high compression is used to ignite the fuel, as opposed to the operation of Gasoline Engine s where Spark Plug s are used.
- is straight ethanol, which is most widely used in Brazil and Argentina . Operation in ambient temperatures below 15 °C (59 °F) causes problems with pure, or so-called neat, ethanol for starting engines. The most common cold weather solution is to add an additional small gasoline reservoir to increase the gasoline content momentarily to permit starting the engine. Once started, the engine is then switched back to neat ethanol. Actually, ethanol used as a fuel in Brazil is the hydrated ethyl alcohol, which is a mixture of 96% of ethanol and 4% of water. However, since the '''E''' nomenclature is not adopted in the country, one can safely tag hydrated ethanol as E100 so as to say that it doesn't have gasoline. Gasoline itself is sold as E20 up to E25, in accordance with current legislation, but the value is not typically disclosed.
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