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The AC compressor pump turns the same speed regardless of your fan setting, but more fan will bring the evaporator temperature up and give the compressor slightly more work to do. I wouldn't worry about this though, because doing that should increase the efficiency of the system by lowering the temperature delta. You're adding more load to the engine (increases efficiency) via more cooling load to the compressor (also increases efficiency), so it should barely burn more fuel.
From what I logged, it seems like AC uses somewhere between 0.05-0.1 grams of fuel per second on my car depending on engine speed (increases MAF reading by 0.7g/sec at idle, increasing to maybe like 1.2g/sec somewhere in the 2000s range from what I recall). Going 65 vs. 60 burns WAY more than that per mile travelled.
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