In this case, I speculate (an educated speculation) that Honda began including 10-30 as a suggested choice, perhaps the primay choice, NOT based upon any mechanical foundation, but rather to improve their standing for federal fleet fuel efficiency averages. Unless I were in a cool area during most of my ridning, I would choose not to consider the 10-30 for this machine. In a cooler area, 10-30 may save you a few pennies in fuel cost over the service life of the bike.
2002 Black Standard Brakes "TE MEGA MONTY"
"Well, Chester; choos'n friends goes kinda fast once the shoot'n starts." Mathew Dillon to Chester Goode