20 hp motors? Oh! You must be thinking about the Iron barrel engine. The fuel injected UCE's produce 27.2 horsepower.
got my first tank of fuel today (low fuel light just starting to flicker on), dealership said they filled it (ill have to take their word for it), I calculated 73mpg. Im at or below sea level (Houston, Tx USA)
I took my bike up a local ski mountain, about 6000 ft elevation at the peak. The last section of road was a little steep as it switchbacks up to the lodge. I could not go more than 45mph on that stretch. The bike ran beautifully, but there's not much muscle left as the elevation gets higher.Scott