Um wow....
Anyway, has your area recently mandated a 10% ethanol mix in the gasoline? It did here, and it hurt my gas mileage.
Yep, that type of mixed fuel really affects the mileage.
Sort of makes you wonder why somebody would want to use so many more gallons of E85, because it may be a little cheaper -- even though the mileage will take a big 25-33% hit.