That brings up a good point. Many large cities run by Democrats have their own unique blends of gasoline. Since air and to a smaller extent ground water are shared resources, surely it makes sense for the EPA to mandate a handful of blends for everyone, different blends in different situations (such as high elevations), thereby reducing the overall number of blends, lessening the price effect of problems with a particular plant, maximizing competition, and coincidentally protecting Chicagoans and others from their own bad choices. Even though selection and consumption of gasoline is a local matter, the byproducts of that consumption affect us all.