The ICE does not start to run the A/C for battery cooling. If the ICE is running for some other reason, the A/C compressor will kick on to cool the battery if needed without the compartment A/C running. For this reason, running the compartment A/C in Hot weather in the normal recirculation mode, maynot use that much more gas. I've driven an entire summer above 90 F and have never had the ICE start to run the battery A/C. However, a hot battery does not perform well.

The good news is, I'm now running the A/C in the normal recir mode and holding 45mpg on my tank. This is also with methanol mixed 93 octane which is on it last few gallons. The 93 octane is giving me a big hit in mpg, and I do not recommend it to anyone with an FEH. When this methanol has quit effecting my mileage, I may increase the 45mpg tank higher with running the A/C. Folks, this is one hell of a FORD IMO.

GaryG