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Are you sure it's the AC that's killing your fuel economy? Is it a lot? (More than 5 MPG?)
If both answers are yes, then maybe your compressor is somehow going bad and seizing up (has anyone heard of this?), or maybe it's a problem with the belt and/or pulley. Either way, have someone look at it - I'm really only guessing, but no one else answered.
If you're not sure it's your AC, this might sound silly and unhelpful, but check your air filter, tire pressures, and change your oil. Any of those things are common contributors to bad fuel economy.
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