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E85 is an ethanol-gasoline fuel mix, usually with a ratio of 85% ethanol to 15% gasoline. Some drivers do have a different option, and that's using E85 – flex-fuel.
A flex-fuel vehicle will experience about 76% of the fuel mileage MPG when using E85 (85% ethanol) products as compared to 100% gasoline. Simple calculations of the BTU values of the ethanol and the gasoline indicate the reduced heat values available to the internal combustion engine.
E85 is an abbreviation typically referring to an ethanol fuel blend of 85% ethanol fuel and 15% gasoline or other hydrocarbon by volume. In the United States , the exact ratio of fuel ethanol to hydrocarbon may vary according to ASTM 5798 that specifies the allowable ethanol content in E85 as ranging from 51% to 83%. [ 1 ]
Ethanol fuel has a "gasoline gallon equivalency" (GGE) value of 1.5, i.e. to replace the energy of 1 volume of gasoline, 1.5 times the volume of ethanol is needed. [4] [5] Ethanol-blended fuel is widely used in Brazil, the United States, and Europe (see also Ethanol fuel by country). [2]
A high-octane-rated fuel, such as liquefied petroleum gas (LPG), has an overall lower power output at the typical 10:1 compression ratio of an engine design optimized for gasoline fuel. An engine tuned for LPG fuel via higher compression ratios (typically 12:1) improves the power output.
In the US, Honda does not offer any E85 powered flexfuel vehicles in 2009. [16] GM has stated a commitment to dedicate 50% of its production to Flex-Fuel E85 capable vehicles by the 2012 model year. [17] Also by 2012 all products of British luxury car-maker Bentley Motors will be Flex-Fuel using a patented fuel-system and an in-line fuel sensor.
In backward provinces and regions, only ethanol gasoline containing 10% ethanol is allowed to be sold: 92E10, 95E10 and 98E10, Some gas pumps use the labels "E92, E95 and E98", but they still represent E10 ethanol gasoline of 92 RON, 95 RON and 98 RON. Sinopec's 98 RON gasoline is called "X-power", and PetroChina's 98 RON gasoline is called "CN98".
"FlexFuel" vehicles have upgraded fuel system and engine components which are designed for long life using E85 or M85, and the ECU can adapt to any fuel blend between gasoline and E85 or M85. Typical upgrades include modifications to: fuel tanks, fuel tank electrical wiring, fuel pumps, fuel filters, fuel lines, filler tubes, fuel level sensors ...