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@pajamas
If I've understood it "drafting" means that a group rides in formation; the leaders break wind gently while the others ride in the pocket created.
The group saves between 30% - 60% of their energy and progressively faster speeds can be maintained as larger groups mean more wind is dispersed.
If I've got my calculations right then the last 12 people tonight will be doing no pedalling at all and going at speeds of up to 105 mph.