Rode another 30 miles on the GX50 yesterday. Lots of speed changes, and stop and go riding. Still impressed with the acceleration compared to GX35(1.34" Staton roller). I suspect a 1" or 1.25" roller would be perfect, if city riding is your jam.
One slight drawback, Honda used the same gas tank as the GX35, so fill ups are required more often. I would typically get 24 miles/tank on the GX35, reduced to @ 19 miles with the GX50, @ 21-22% decrease in range, so far.
114mpg compared to 144mpg on my Giant Talon 2 29er
Also noticed I could only get it up to 33mph today, compared to 36mph a while back. Friction pressure, disk brake pad rub, weather, oil change...who knows??
It's still the bomb diggity! Love it.