My bike normally idles at 900 rpm. When I started it today in very hot weather it was idling at about 500 rpms but very happy at that.
for my hour and a half commute home I noticed the bike to be buzzier than normal if i got on the throttle but I could not find my normal sweet spot on the freeway. I felt like I wanted to be between 5th and 6th gear most of the time. I normally cruise at about 5k to 5.5k on the freeway.
Once I got home and restarted the bike it appears to be back to normal. In 17k miles I never have seen this happen before.