That's the question. Is the only requirement for how we fuel our vehicles cost? For many it is. If we are going to wait to make any changes in our fuel choices until the new fuel source is not only cheaper but more efficient, we may have a long wait. The costs of ethanol production have already dropped significantly. As far as fuel efficiency and cost of running a vehicle, flex fuel vehicles are able to burn e-85, but are still weighted more toward the side of burning gasoline. Computers and sensors allow for a number of variables to change according to the exact mix of the fuel, but it is still a compromise. If e-85 were commonly available, so that vehicles could be optimized for a predominantly ethanol mix, you would see different figures. But until the oil companies are forced to make the fuel available, that isn't going to happen, and they will fight it tooth and nail every step of the way.