"Restorers of vintage cars point to problems caused by the decay of older rubber components like seals, gaskets and flexible fuel lines, which can deteriorate when exposed to ethanol-blend fuels. Some replacement parts are available in modern materials that resist alcohol damage, but not all are."
The ethanol/biodiesel industry is doing well supplying gas stations with ethanol for gasoline blends. There's also pressure from the federal government to increase the volume of renewable fuel distributed in the country. It's the source of conflict for various interest groups, and the pressure will be increasing.