Flex-fuel vehicles

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Bioenergy > Technologies > Vehicles > Flex-fuel vehicles


Typical Brazilian flex-fuel autos
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Typical Brazilian flex-fuel autos

Flex-fuel vehicles (FFVs) are vehicles that can run on different types of fuel or on variable blends of two fuels. In the United States and Europe, the term commonly refers to vehicles that can operate using a blend of up to 85% ethanol and gasoline (E85). In Brazil it refers to vehicles that can run on any blend of gasoline (E20-E25 is the mandatory blend in Brazil) and ethanol (E100).

Production flex-fuel cars

Production flex-fuel vehicles are available from several predominately US-based automotive manufacturers [1]. Brazil has a large base of flexible-fuel vehicles and manufacturers as well, that reached 6 million of FFVs in August 2008.

Aftermarket & flex-fuel conversions

Most modern fuel-injected vehicles should at least run with E85, since the engine control computer will increase the fuel/air ratio based on the oxygen sensor signal. This is not optimal, and could damage various fuel system components due to swelling of rubber seals, or corrosion of parts which have not been qualified to run with that high a concentration of ethanol. However, if you understand what you are doing, and are willing to either fix your car yourself or pay a mechanic to fix your failed experiment, you can run a non-flex fuel vehicle, such as a toyota prius on E85. One such example is documented on User:hozer.



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Flex-fuel vehicles |

Vehicle fuels: Ethanol blends (E10, E85) | Biodiesel blends (B2, B5, B10, B100)

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