I think fuel works best when it's totally vaporized, I think your best performance would be when it's 'almost' hot enough to evaporate. Think about this; when you just about run out of fuel and you get that last 5 seconds of higher revs just from it leaning out (more air & less fuel => higher vapor content). I think you want your fuel plenty warm for the most power and efficiency! It's your electric TC motor you want to chill before the race.

-John