Flex Fuel? What the heck is that?

Flex fuel?
Starting to see it around huh?

But what is it?
Flex fuel vehicles are made to operate on either gasoline or a blend of ethanol (E85)
Except for limited changes made to the fuel system, these are nearly identical to their only gasoline counterpart.

With no loss in performance when operating on E85. But a downfall is that ethanol does not have as much energy per gallon as regular gasoline. Meaning you will get less miles per gallon on ethanol. Approximately 20-30%.