Not to mention the flex fuel scheme that GM, Ford and Chrysler pulls. CAFE fuel mileage calculations permits ethanol compatible vehicles to assume that it will be driven 50% of the time using E85 ethanol. For the worst gas guzzlers, they add the additional ethanol hardware to get the “lower” fuel mileage. Hence you only see the flex fuel badge on big trucks and SUVs. And ironically, the flex fuel label is really a label that it’s a gas guzzler.