Google for keywords "Sam Whittington HPV" to get started on streamliner efficiency.
The current level ground speed record for a human powered vehicle is ~81 mph, and a very skilled rider can do maybe ~1/3 hp in a sprint. HPV sites have the particulars. Since aero drag increases exponentially with speed, 60 mph is a lot less drag than 81 mph, so less hp and thrust is needed. Maybe half as much, depending on all sorts of other variables, aero, mechanical, weather, etc..
trautotuning 
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