That seems almost unbelievable. My KLX never got more than about 52 when stock. It only went down from there. Off road at a fast pace was mid 20's.I get 70 MPG pretty consistently on my KLX. Ridden conservatively I can get high 70s but I rarely do that. If I really flog it gas mileage sometimes drops into the high 60s. I ride the KLX for fun. I almost never use it as a commuter because my 150cc scooters are so much more convenient and they get around 85 MPG.
I kept the CV carb as it had better mileage and the power gain from the edelbrock was negligible. A dyno jet kit and it was good to go, started first kick every time.