The G-Tech DOES require you to input vehicle weight to calculate HP. I would imagine that Cd is insignificant when accelerating 60 MPH. You would still need to subtract the approx. 15-20% parasitic drivetrain loss to estimate crankshaft hp. On the G, it may even be more like 25%, but you would definitely be 'in the ballpark.'
ps. It's good 'talking' to you too...it's been a long time. Still have both W124s?
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