I just rode Capitol Reef National Park with my wife on the back. The bike says 165lbs max (Vino 50) but we´re about 265 total, plus helemets and a couple of water bottles. Barely passed 30 mph up a 6% grade at over 7000´ elevation, which ain´t bad, but the mpg dropped to 85. I usually get closer to 100. I love my little 50, might add a 125 to the stable, or a bigger Yamaha...