This is one of those recurring threads - I'm not necessarily disputing the study but one time I tried to find the source magazine, and I failed to find "Machinist Workshop" magazine, "Machinist" or anything similar with a report like this.
You would think that with all the car-related boards on the net someone would have chased this down and reached the source, but I couldn't find it.
Rgds,
Chris W.
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