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I am interested in knowing the answer to the question.
I think my screen might improve my aerodynamics. The bike seems to accelerate faster from 70 to 80 mph with the screen on versus with the screen removed. There's no doubt that it is much more comfortable above 50 mph with the screen than without it. It removes all the wind pressure from the upper half of my stomach, my chest, my shoulders, and most of my helmet.
I'll try a little experimenting this summer. I'll run one tank with the screen and then one without the screen and keep repeating the sequence until it gets cold. Maybe I will see some difference in mileage? I've been getting 54 mpg repeatedly since March. The three tanks in February and early March were 65 mpg but that was a lot of riding on dirt roads running between 25 and 50 mph. Since March most riding has been 50% highway at 50-60 mph and 50% in 1st and 2nd gear on forest service roads and trails.
The crosswinds are crazy on this thing! When they predict gusts above 40 mph, I don't ride anymore.
You might notice I tried to set my bags to act like a boat tail and I bought a modular helmet thinking it would be more aerodynamic than a motocross helmet. I'm tempted to raise the screen more. That might take the wind pressure off the top 2-3 inches of my helmet.
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