There are other factors that might come into play to really skew these results.
For instance, in my car, when I have the A/C on it takes more pressure on the pedal to get up to the same speed as if the A/C were off.
With that said, the A/C almost forces me to drive slower and with less pressure on the throttle, thereby making it impossible to accurately judge exactly how much of a load it is putting on the engine.
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