I'm not running quite as much -- I have heated grips, Gerbing jacket, and Denali 10W LED lights that are the major additional draws. Even with everything cranked up, I'm still in the ~13.5V range on the highway. Where you run into problems is if you're in stop and go traffic. With all these running, at a light I'll drop to the 12.1V range. Not a problem for a minute or two (if its a long light I'll bump the rev's for a moment) but in any prolonged stop and go traffic it will become a problem. I'd absolutely agree with GW on adding a voltmeter if you're running anything more than heated grips.