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Well by having the air con on your using like 2bhp i think... so isnt turning the air con off as good as removing it... apart from the little bit of extra weight :S
In this hot weather, I'm glad I've have aircon. Any performance/economy gains will be more than offset by having all the windows open trying to stay cool and arriving at your destination sweating like a wh0re on night shift!
there is a theory about having car windows open a certain amount can actually reduce drag thus increasing straight line speed, have a look at the touring cars on TV next time they're on, this theory all stems from that type of racing