What is it about fast cars? Anyway I've stumbled on something called A1-Grand Prix, which pits teams of national drivers against each other in identical cars, and they're going to be fuelling them with a 30% blend of ethanol in 2008, according to Greenbang. The mixture is almost certainly called "Hiperflo" E30, sourced from sugar beet in Europe and produced specifically for the series by racing fuels specialist blender Petrochem Carless.
There was some hoopla in the US a while ago when the Indy Car people said they were adding 10% ethanol, which sounds impressive until you find that before that they were using mixtures of ethanol and methanol, chemically its cousin, for years. Slapping 30% ethanol into gas will be more of a challenge for engine builders to cope with, I guess.