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As a comparison point, my GN is +1 front, -2 rear.
It used to get an indicated 83 mph tops with stock sprockets, then it fells to 79 or so with taller gearing.
Although with the cardboard kamm back, 86 was seen once.
Anyway, the GN got a lame front end as far as aero goes so you should be much better there.
And my average speed is more 60 to 70 on the highway and I get 75 mpg so I assume you should get much better.
Even with the taller gearing I use 5th from 30 mph on up.
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