The nitro would bring the average temp up but it would still be less than methanol. It should also improve any catalytic reaction, though I don't know if it would be any less with ethanol. Platinum works by attracting nitrogen so that the fuel molecules near the element are more exposed to oxygen. Glow plugs also work by heat retention, since the fuel burns hotter near the element there is more heat to retain. I can't say how well it would work but if you have to use a lot of nitro that would ruin any cost savings. Another problem is getting ethanol dry enough to give a good idle. 180 proof is 90% pure with the rest mostly water.