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To use the fuel consumption meter to calculate power to calculate coefficients of drag and RR wouldn't add any new information, I don't think. A proper power meter would enable measuring the "demand" side of the equation directly, regardless of engine "state".
I propose a force sensor that measures the reaction force to the "propulsion" force. I only see two mounts on my car that counteract the torque from the drive shafts (the other two are on a "left-right" axis) and both of them should see a force that is proportional to the propulsion force.
I'd like to know what practical problems there are with a sensor in that environment. How bad are the vibrations in comparison to the measured force? Are there high sideways forces too?
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