Ethanol is a fine concept, as an alternate auto fuel - except, what are you gonna do when there is a blight?

Well, that is a draw back about using grain based fuel for burning in your car. Regardless of whether it is a wheat or corn blight (just another opportunity for terrorists to exploit) Even a drought or other severe weather can affect crops. What are we gonna use - our abundant crops of Spuds instead? Won't that have the effect of not having fries with your burger, not to mention making a big dent in vodka production for human consumption.