My FZ6, with its 13,000 red line and 10,000 rpm torque peak, is just waking up at 80 mph. It's great on the back roads but just demands to be opened up on the highway...so I (try) keep it off the highway. But if my travels call for highway duty the FZ is the most suited bike I have - it's just smooth as glass and comfortable all day long.

The Cafe and the Tracker both like 50-60 - but at different rpms. At 60 the Cafe is at 4,000 and the Tracker is at 6,000. The Cafe just vibrates too much above 70 mph for my comfort. The Tracker just vibrates. It's happy to go 80-90 mph, but I'm not.