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Remember that torque does nothing unless it "operates over rotation".
Throwing units out of it for simplicity.
Power output = Torque * RPM.
So DarkSunrise your method needs to take account of the drop in RPM the torque is applied at. (As above if you just forget the units and multiply torque directly by RPM is easiest). If you actually want "Watts" or "Horsepower" there are a few more complexities.
Examples....
200Nm torque @ 3,000rpm == 100Nm torque @ 6,000rpm.
200Mn torque @ 6,000rpm > 220Nm torque @ 4,500rpm.
In terms of power output, which is the energy transferred to the car in the form of momentum. aka Speed.
EDIT: And... if your engine is delivering 200Nm torque at 6,000rpm, regardless of what gear you are in or what size of wheels you have the actual power output at the wheels is the same. In a lower gear, you will just have higher torque applied at a lower rpm, same energy.
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