How does Climate Control affect MPG?

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15 Aug 2006
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Leicester UK
How does aircon usually affect MPG? When it was first around I don't doubt that it guzzled fuel quite happily but have things like climate control, which presumably reduces the amount of power it uses when the correct temp is reached, made it all more efficient.

I've got climate control in the leon and the X5 and it doesn't seem to make a whole lot of difference, but then I don't tend to leave it off long enough to notice properly.
 
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