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The best way to use A/C is put the temperature control on full cold. Then, turn your fan on the lowest speed setting to stay comfortable. However, the fuel economy hit can still be pretty drastic. Some reports say up to 30%. I find it much lower in my experience, but I use it very minimally.
I probably wouldn't bother with the roof rack if you can't remove it easily. Instead, do a grill block, air dam or both. The gains will probably be greater anyways, and easier to do.
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