The Mito generator makes 125 watts of power. The lights (incliding headlight) pull about 75-80, so you should have plenty of power to run grips (pulling about 25 watts), if you haven't already added a lot of other electrical accessories.Update time - I went and bought some yesterday on lunch and fitted them when I got in from work. On my way into work this morning they got hot within about 3mins - all seems good.
I'm not sure if I like them though as they are thicker than normal grips. On the important side of things my palms were very warm, fingers still got a bit cold.
I will keep them on over the weekend and make my mind up I think - also if I go to start my bike at the end of the day and I have a flat battery I will not be impressed lol