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Carl Edwards is a former student of mine. Once in a while we would talk race strategy. In NASCAR drafting is huge, and has pros & cons. There are situations in which you want to be the lead car, and situations in which you can 'slingshot' from drafting; sometimes complex coalitions develop to exploit these effects.
Obviously much less salient for road courses, although micro-effects on the surface (clearing dust, adding rubber, temperature) might have some consequences.
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