I'm not so sure I agree with that 20% extra fuel consumption using the air conditioner. It would all depend on your driving habits. I've tracked this before, and at highway speeds the difference is only a few percent at most. Mythbusters actually did a good test of this quite a while ago at highway speeds.
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Not so true
Submitted by Jon on January 8, 2008 - 07:10.
I'm not so sure I agree with that 20% extra fuel consumption using the air conditioner. It would all depend on your driving habits. I've tracked this before, and at highway speeds the difference is only a few percent at most. Mythbusters actually did a good test of this quite a while ago at highway speeds.