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Originally Posted by Keithuk
Oh I forgot to mension about this reply. Anything that takes power of the engine uses fuel I don't care what you say.
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Really now. Does that mean you're not even going to consider my response?
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I left it for another 30-40 miles then put it on again and it dropped by 5mpg each time. Now depending on the system and engine it can knock off 5-7bhp, so are you still saying it doesn't affect the mpg?
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Yes I am going to say it doesn't affect the mpg in any noticeable way. It doesn't really take BHP off so much as it a product of the torque. I've not noticed having the A/C on affect the displayed mpg at all. Also the onboard display is not where you want to go for accurate data anyways; the algorithm to generate the numbers is far from perfect. It is very susceptible to inaccuracy the more uneven terrain is involved.
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I'm not that bother as in the UK its not really need AC, I know AC dries the air as well? 
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Was this a question? Yes it does put out air with lower humidity.