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It's pretty interesting AC is effecting your mpg quite a lot. I did some driving today with AC on, and got pretty similar to what I normally get. I set the temp to 75 and it seemed like a reasonable temp, I had family with me, so car had more weight, but more up town driving. Trip home I hit almost 50mpg driving 55mph with everything all warmed up and such with AC on.
Maybe your AC charge is low so it's running the pump more to get the same amount of cooling. It's not the perfect way of doing it, but getting a R134a refill kit and hooking it up with the gauge so you can see pressure should give a reasonable idea of how the charge is doing. If it's low, you might need to replace some o-rings and such. The instructions on the can/kit should say what the pressure should be for a given temp.
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