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Hey Rick,
I did some testing albeit a little crude with dual pusher fans. I hooked a high resolution amp meter in line to see if the amperage draw increased at a few highway speeds. My thought was if the airflow was higher than their RPM it would load the circuit and amps go up. I found the load or amp draw on the motors did not increase but dropped a small bit.
It would be easy enough on most applications to loosen set screw on fans and remove from the motor as a with and without test.
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