Increased MPG

Jordo!

If one of the factors that affects target AFR is IAT's then that would certainly be true.

I think it gets confusing in part because power and MPG are kind of unrelated issues when you get down to it.

You could coast downhill consuming very little fuel and engine power, and improve MPG, or you could destroy a new set of tires with a smoky burn out, consume tons of fuel and produce lots of power (or, well, torque more precisely), go nowhere, and have terrible MPG.

Fuel consumption comes into play on the basis of fuel consumed to make so much torque over a period of time, but it doesn't necessarily translate into distance traveled.

That's why gearing and drag (either in terms of tire inflation, weight, or the ability to deflect wind) all wind up being such surprisingly important factors in MPG (those little plastic wind deflectors in front of the front tires come to mind...).

That's also why city MPG is always lower than highway MPG; taking off from a dead stop (i.e., stop and go driving) requires more energy than rolling along with the help of inertia.

I don't know about heat losses related to airflow, but losses as heat matter definitely in some aspects of MPG. A fluid coupling trans, for example, will lose power in the form of heat, and therefore have a poorer MPG than a solid connection to the driveshaft operating under the same conditions (although gearing and time spent in a given gear will affect MPG too).

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SouthArk370Z

The IAT is located in the MAF and used by the MAF circuit as part of the density calculations. Details are in the FSM.

Good explanation.

Any effect on MPG/efficiency due to cooling from airflow is pretty insignificant. Keep in mind that the air is "cold" only until the piston starts up.

Any heat loss means less efficiency. The "perfect" engine wouldn't have a radiator (and the drive wheel would be bolted to the crank). Some of the hyper-milers run their engines very hot, but that will lead to detonation problems (plus increased wear) for a "normal" driver.

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