I almost never put the gas pedal to the floor, and honestly, barring emergency situations, I don’t believe that a good driver should have to. That said, I almost always shut off the AC when I need to pass or go on an onramp, not so much for fuel economy, but to have more power at lower RPMs. I drive a small car, and it feels like the AC sucks about half the engine’s power. Turning it off briefly makes very little difference in the car’s temperature, but it makes a big difference in how easily I’m able to drive my car safely.