And you may notice I don't mention speed figures as an alternative, because I don't think they are a very good tool to compare across eras. It isn't that they couldn't be, but that isn't how they were designed here in the USA. They were never meant to be historical measuring posts, they were designed to be a betting tool. As bettors, we have no reason ever to compare races a couple years apart, let alone a couple decades apart.
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