I was forward a link from a client which discuss the affect of HOD. One of the topic that was being discuss was "Warm Air Intake", I guess as warm air is induce to the engine passing through the MAF sensor, it adjust to that (deccreasing fuel).
I am not all that familiar with the functionality of the MAF as it reacts to warm air, maybe those who are well verse on the subject can enlighten me.
I have heard a group experimenting with "Warm Air Induction" to increase fuel mileage and have great success, then again on certain cars it will kill the performance and mileage. Not really sure if it pertains to fuel injected cars or carbs.
If the MAF adjust to warm air (decreasing scheduled fuel) I can see how inducing warm air through the air box would help. I guess I have some reseraching to do.