Just to clear up all the misinformation that is being spread here, fuel temperature does not appreciably affect efficiency. The density of fuel changes very little with temperature.
Quite frankly, I'm pretty disappointed overall at the lack of professionalism displayed in this thread; although it definitely was instigated by the starter of the thread, this is not who we are here. This is not what TDR is about. The childlike silly bantering of mis-information has no place here...and those who instigate it with the same level of silliness should be ashamed.
--Eric