This article shines a spotlight on an alternative fuel known as flex fuel (also known as e85 gas), which is more mainstream than most will know Before exploring the benefits and negatives of flex. All fuel contains ethanol to some percentage, but what flex fuel does is drastically change the ratio. A flex fuel vehicle (ffv) is an internal combustion engine automobile designed to operate on more than one fuel source from the same tank This allows the engine to run on standard gasoline or on an alternative fuel blend containing a high percentage of ethanol. Specially equipped vehicles designated as flex fuel capable can operate on e85, a mix that can contain from 51% to 83% ethanol and just the remainder as gasoline.
E10 is seen as regular gasoline, while e85 is flex fuel, and is composed differently from regular gas But what does that actually mean
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