Ethanol price spike means you pay more for gasoline

Ethanol used to make gasoline cheaper; its recent surge is adding costs per gallon

Most of the gasoline sold has some ethanol in it, with the fuel additive accounting for about 10% of the volume of 134 billion gallons of gasoline consumed in 2012, U.S. government data show. Prices this year have surged about 30% to $2.30 a gallon, according to FactSet data.
“No market in energy has had the off-the-charts increases that we’ve seen in ethanol in 2014,” said Tom Kloza, chief oil analyst at
Ethanol price spike means you pay more for gasoline - Commodities Corner - MarketWatch

E10 and E15

Vehicles will typically go 3% to 4% fewer miles per gallon on E10 and 4% to 5% fewer on E15 than on 100% gasoline.

E85 (Flex Fuel)

MPG. Due to ethanol's lower energy content, FFVs operating on E85 get roughly 15% to 25% fewer miles per gallon than when operating on regular gasoline, which typically contains about 10% ethanol.