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Siro,
Modern aircon systems are vastly more effiecent than systems a few years back.
Even with high outside temperature or humidity you should only loose around 3mpg.
Above 40mph the aerodynamic drag caused by an open window would probably cost you more than running the aircon.
Make sure you have it switched on for at least one journey every two weeks or so. An aircon system needs to be kept running even through cold weather to pressurise the system, lubricate the seals and maintain the compressor. Excellent for demisting windows in cold weather anyway. [img]smilies/smile.gif[/img]
Lee
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