The higher the MPG of a vehicle, the more MPG are "lost" when running AC. A 100 MPG vehicle might lose 10 MPG with AC use, while a 10 MPG vehicle might lose 1 MPG. My point being that measuring AC energy consumption by effect on MPG might not be the best way to understand it.
There is a PID that can be monitored to see exactly how many watts the AC is consuming.
Off topic, but once when I was rotating tires on the Prius with the front end off the ground, I noticed it was extremely difficult to turn the wheel. On front wheel drive vehicles, usually it takes medium effort to turn a wheel and the other axle will rotate counter. In the Prius it seemed to take a lot of effort, and I don't know if that is normal or not?
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