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You'd also get different current readings, depending on how much load the motor is under. If the car is off the ground, and the wheels spin free in the air, the mA's will be very low, if you stall the motor (stop the wheels with your fingers), that should give you a good reading of the motor's max current draw.
The steering coils pull a fair amount of current too, (havent actually measured), but if you drive in a circle a lot, the run time gets cut nearly in half. I think the motor probably draws the same, or less current than the steering coils do, (when the car is just "cruising" and not climbing, or just starting)
I'm going to try an indirect measurement of the current, with the car on a slow charge platform, with the battery at minimum charge. The ammeter will be in series with the charger, so there will be a constant current already going to the car.
Running the motor, or the steering will cause the current to increase (this test will only work on a with a battery that is almost out of charge,so it doesn't have the chance to store up much charge and delay the current readings) It will act more like a capacitor when it's in this state.
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