A couple thoughts.
One, the faster an electric motor spins the less electricity it consumes. So if it is turning on at highway speeds there is a very likely chance it will use less electricity than at a stop.
Another thought is that more airflow through the condenser could, in theory, help the compressor use less energy to compress the refrigerant. So now not only do you need to actually check and measure the power comsumption of the fan, it would be a good idea to measure the new power consumption of the compressor. Of course there are many factors that could play a part in the results.
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