Whats Flex Fuel (2007 Used Chevrolet Impala LS)?

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ppp_lil_g

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I have a 2007 Chevy Impala LS, and it says I have flex Fuel, but I dnt know what it is. Please help.
 
I drive the same car (company lease). Flex fuel means the fuel system is rated to handle gasoline, E-10, or E-85. Beware of ethanol. It may be cheaper, but your fuel economy will drop a lot and the engine will run fairly rough. My leasing company forbids use of E-85 in any of our cars.
 
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