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A 90's basic 250 (my GN) ridden 1/3 in the city and 2/3 on the highway at speeds no lower than 60 mph (and no faster than 80 mph) with the only mods being a gear ratio swap (15/43 to 16/39) and a small windscreen returns something between 75 and 80 mpg.
That being said, a bike tuned for high MPG at higher speed is not gonna be appropriate for trailering.
You could always carry a large cargo box as part of the aero package but trailering seems so odd and basically dangerous with a bike ...
Things is you want stuff at each end of the scale but to optimise either FE or carrying hability, you'll need to do some compromise on what you expect.
Bigger FE / smaller bike / limited carrying load
vs
Better carrying load (though not too impressive) / bigger bike / smaller FE
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