Dean, wrote "At 70MPH in normal mode it was running about 4100 RPM. I shifted to manual, it went into 5th gear so I shifted it up to OD, the RPMs were the same."
Today I checked the speed vs rpms today on my 03’ 650.
MPH - RPMs(auto) - RPMs - manual
60 - 4,000 - 4,000
65 - 4,200 - 4,500
70 - 4,400 - 4,800
75 - 4,800 - 5,000
80 - 5,000 - 5,200
Note: These numbers where obtained on the interstate highway in my area. There is not a lot of flat sections here to test on.
Maybe some other owners (03, 04, 05) could check their rpms vs mph and post what they get.