You should do it! My husband and I loved riding our scooters around Duluth. I got mine in 2008 I think, when gas was very expensive. I was going to grad school at UMD, and the scooter/motorcycle parking is awesome (close to the buildings and free) on campus. Spent about $2 a month on gas, when it was near $4/gallon. 

It's so fun riding down Canal Park/Park Point (I recommend giving groups of staring kiddos a friendly little beep beep -- they love it, haha). Duluth is a really fun city to explore on a scooter. 

My husband is a bigger guy, over 200 lbs, and our 125cc Yamaha Vino had plenty of speed -- he would take off much faster than a car could going up, say, 21st Avenue East. I was around 150 lbs then and the 50cc was enough power for me to take off too, and keep up with traffic on busier streets (Woodland, etc.). The 50cc would dog with my husband on it though. 

We would even go on roads like Arrowhead -- you can pull off to a side street and let traffic clear out if you feel like you are in the way of others. But we just usually kept to the right lane and it was fine. I could get the 50cc up to 40-45 mph. It topped out at about 35 mph with my husband on it on a flat road.  We liked having both a 125cc and a 50cc, so when friends visited they could ride the 50cc -- no license required -- and we could cruise around town.