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Originally Posted by aerohead
1) If you have reduced aerodynamic drag, you've altered the BSFC of the engine.
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BSFC is quite irrelevant.
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2) You're operating the engine at a load that it was never designed for.
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Complete and utter rubbish. Do you know what engine load actually means?
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3) Unless the topography of the engine's BSFC map is exceedingly 'flat', it will fall to a less efficient island of specific fuel consumption. It's not negotiable.
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Fuel consumption of any type is irrelevant.
It is not any part of the technique!
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4) Powertrain efficiency varies as a function of transmitted power. If your aerodynamic modification lowers the road load on the car, it cannot be presumed that the powertrain will have the same mechanical efficiency as prior to the modification. It's become an unknown.
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To the tiniest, tiniest degree, yes. But quite irrelevant in the testing regime we're actually using.
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5) Between the BSFC and Powertain, you now have two unknowns.
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We're interested in factors that will have measurable impact the results. These don't.
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6) If your basing aerodynamic performance upon mpg, you'll never be able to actually parse out what went to what.
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The technique has nothing to do with mpg!!
You seriously have no idea what throttle stop testing involves, do you? This is ridiculous. You're arguing about a technique of which you have little knowledge or understanding.