There is an upside, if you are running alcohol in a gas class and need an edge it is nothing to dump light load nitro in the tank on the way to stages. These days races are won or lost by thousandths. A little smell good additive in your fuel to mask the odor and a very light load of nitro could put you over the top. Not as easy to pull off with gasoline. Actually I have an engine that if I decide to drive it will need to be alcohol sprayed, uh to cool the combustion chambers. Eventually it will have to have a match race with a friend that has a blower car. Nothing in the world to stop me from dumping a load of pop in my alcohol tank for just one pass.