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The old rule of thumb is
three quarters of your red line. In other words...if your bike red lines at 10,000rpm, you can cruise at 7,500rpm.
On my Sprint, 75Krpm must be around 140 mph. I guess!
If you are concerned with fuel economy, just set your on board computer read out to instantaneous fuel mileage. On an even flat surfaced road, you can experiment with speed and gears to see what gives you the highest mpg.
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Warden Ross
Age Quod Agis
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