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Will E85 gasoline harm a non flex fuel car?

Yes, using E85 gasoline in a car not designed for it (a non-flex-fuel vehicle) will almost certainly cause damage. E85 contains a much higher percentage of ethanol (up to 85%) than regular gasoline (which is typically less than 10%). This higher ethanol content can:

* Corrode fuel lines and other fuel system components: Ethanol is corrosive to certain materials commonly used in non-flex-fuel vehicles' fuel systems.

* Damage seals and gaskets: Ethanol can cause seals and gaskets to swell and fail, leading to leaks.

* Attract water: Ethanol absorbs moisture from the air, which can lead to rust and corrosion in the fuel system.

* Reduce fuel efficiency: While E85 has a higher energy content per gallon, it requires more fuel to produce the same amount of power, leading to decreased MPG.

* Run poorly or not at all: The engine may run rough, misfire, or even fail to start due to the different combustion characteristics of E85.

In short, never put E85 in a vehicle that isn't specifically designed and labeled as a "flex-fuel vehicle" (FFV). The potential for damage is significant and costly to repair.