I have a staton kit that has about 6-7K on it with a RS eh035 and I regularly get 200+MPG with it on long rides. This includes very large hills that it gears down on and climbs with ease. Top speed is crazy fast as well, and cruising my rpm's always stay the same when I have my throttle lock on I just shift up and down on the hills. My bike is a Specialized Big Hit (rather heavy downhill racing dual suspension mountain bike).