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I'd stand by the idea that AC becomes less of an issue at speed.
At speed, you have more air going through the condenser. Which means the compressor cycles off more. As Daox stated, it will do this as a matter of course, without input from you. And the wind cools down your car, too.
Perhaps if the compressor was a constant load, and never went off, then it'd be different. You'd need to live somewhere really hot to test this, though.
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