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I live in hot-and-humid Louisiana and use the air conditioner for most of the year, always in recirculate because it's counterproductive to bring in un-conditioned-air.
I might lose a few MPGs because of the AC's load on the engine, but it's worth every one of them!
My Mazda3 has a button to press to disengage the AC compressor, leaving the fan to drain the ducts of cool and dry air until it warms up again, and I find myself occasionally pushing it on-and-off when the temperature and humidity aren't too bad in a bid to save a few drops of fuel. Probably not worth the effort, but hope reins eternal.
The 2.0L engine doesn't seem to be very affected by the extra load of the AC, as I can't feel the compressor cycling, although I sometimes can hear the "click" as it cycles on-and-off when idling.
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