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All things being equal, the test asserts a difference. It's funny, people get dogmatic about mechanics as well. I suppose we're all very dogmatic about something that is simple and effective because so many of those things turn out to be hoaxes.
In this particular case, if the test is an accurate, unexaggerated test set that is not suppressing information (like they did the test on different days with different air pressure while the tempurature was constant or whatever), then it asserts that if you drive a 'Vette or even a water cooled car, it will make a difference.
I guess the only problem I'd have with it is the differences between a Vette and a 911. The same test performed on a 911 would be good evidence to me, and I'd like to see it.
But those of you who are dogmatically against the cool collar ought to at least consider what it is about the test data you do not like. What it is about the test you do not like rather than simply dismiss it because you assume, without proof, that it can't actually work.
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