Methyl ethyl ketone is at least the solvent of choice in the aviation industry. The general rule of thumb in those circles being that everything's more toxic than in the automotive department: leaded AvGas, high sulfur jet fuel(not to mention the additives they throw in), hydraulic fluid which they at least strongly discourage from ingesting. It does vaporize quickly, dissolves most glues and paints and all grease, much better than acetone. Considering the bother we go through to put on gloves and masks when dealing with it, i wouldn't use it as fuel.
Block heaters do take a bit of electricity, but they do save enough fuel in cold weather to justify their use; 1/2h in 5 C to -5 C, 1h down to -15 C, then 2h for below that. There are fuel burning ones too, no cord or plug necessary, but they are more expensive. Electrically heated carburetors do exist, they shouldn't take much power at all considering the small mass of a carburetor. Even less if you just heat the fuel in the float bowl directly. It takes 1 minute to heat 1 dl of ethanol 40C (-20 to 20C, for example) using the power of your low beams (not USING your low beams of course, but the same amount of electricity). If your battery can't take that, get a new battery, you won't be able to start an engine on gas at -20. I'm inclined to think that an EFI engine would start quite well in freezing weather, at least down to the point where block heaters are recomended anyways. But a heating around the fuel lines wouldn't be impossible either. Winter's coming late this year, no snow on chirstmas! And this is Finland we're talking about! I'd like to try out my snowmobile on ethanol, but the large batch production's the hard part, it being illegal in Finland and all... So if the cops ask i didn't distill a test batch of around 3dl with a steam juicer with the top sections flipped around and the middle filled with glass plates. It might have burned had i done so :) Not to mention i can't use the snowmobile on any fuel with no snow around!
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