E10

All gasoline vehicles are ethanol-capable and can use a blend of up to 10% ethanol. This E10 is a blend of 10% ethanol and 90% unleaded gasoline? and is the most common way ethanol is sold to motorists. Since the 1980s, all automakers have covered the use of up to 10% ethanol under warranty, and no engine modifications are necessary to use E10. E10 is a cleaner burning fuel than straight gasoline.

A vehicle designed and able to use an ethanol blend higher than 10% is known as a flex-fuel vehicle. That said, a study¹ has shown that regular, non-flex-fuel vehicles are able to use greater percentages of ethanol blended into gasoline without reducing fuel efficiency or impacting fuel consumption negatively.

One study² has shown that cars using even an e10 blend have a significantly improved carbon footprint over all electric vehicles.

References

¹Optimal ethanol blend level

² e85 electric Tesla carbon footprint study