I would consider even partial streamlining for 75mph 80mpg. a tail/trunk that matches the size and profile of the front of the bike, and tapers to a point at the rear would reduce drag without adding frontal area. smoothing over/ removing protrusions, vents, and such can help too, but one must figure out which ones are necessary, and which are just eye candy. if the typical width of a sport bike fairing were 18" then a tail would only need to extent 3' behind the rider's hips to follow the template, and come to a complete point.
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