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If you look at how far your REx extends your range, it's fairly easy to assign a MPG value to the energy the REx can produce.  Yes, it never directly, mechanically drives the wheels, but the energy it produces does move the vehicle, and that distance is fairly easily measured, and it tends to be less than 40mpg.  If you can use the entire 2.4g, and figure out how far that adds to your EV only range, those numbers reveil it's not super efficient.