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First rule of thumb (imho) NEVER SUFFER!!!!!!!!!
as a general rule, when its's on low or high, it's on. I let mine get my car as cold as fast as it can. the I adjust the therosate (I have a digital screen) to 74 or what ever and forget it.
I have run tests on the highway at 60 mph. A/c on window up. then a/c off windows down. in a 99 vaden plaus jag and an 2002 infiniti Q45. both lost 3-4 mpgs with the windows down.
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