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Dunno. Around 3000 feels the smoothest, so it's good for cruising (interesting how this smooth range goes down with lower gears, it's more like 2500-3000 in 4th, and ~2000-2500 in 1st).
When I pulse, I usually go up from this smooth range. 2800->3600-4000 in 5th is a typical thing I do (which means 90-100km/h | 56-64mph pulses) - though if I wanted to break my record and didn't care for running semi-normally I'd probably go down a gear or two to get lower aero drag, and P&G there.
Air drag surely takes over at these speeds: I've experienced that my winter tanks got a bit better when I started to ride in so low temps I couldn't bear the wind anymore and I went down to 4th and slowed to 50-60km/h (31-37mph).
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