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@gbj_tester
The old rule of thumb was a 20% reduction in power when correctly behind another rider at race speed. That probably means about 100mm behind at 40km/h. The draft is still worth having out to about 3m behind another solo rider in zero-yaw conditions, a bit more if you're going faster. With a little cross wind and no option to echelon effectively, and at the lower speeds involved in commuting, you'd need to be dangerously close behind even if the draftee knew you were there to get any worthwhile benefit.