My ZZR250 made 400kms on a tank before i had to switch it to reserves. I'm surprise how fuel efficient these bikes are, and they're not that slow. And mind you, the way i rode wasn't very conservative on this tank. So when i upgrade to a 600, will i get the same fantastic fuel efficiency? I'd interested in the 600 sport bikes like gix, r6, cbr, etc...those who have these, what do you get out of your tank? and those with the mean street fighters, what do you get?