Well, I finally dropped off my bike earlier today for a full service (...and installation of some new pirelli tires) at ~5000 miles. I skipped the 600mile and 4k mile services so the valves were never adjusted. I did all other maintenance myself. Ima pick it up tomorrow and I will let you guys know how it turns out and if I feel any difference in performance. I'm curious about the valves needing adjustment, would that affect fuel efficiency?