I road a 250cc Kawasaki ninja for a few months and I was getting 80 mpg just riding normal. thinking back on it, I am curious how much better I could have gotten that with a k&n intake and a better exhaust, then give it a conservative tune.
Scooters can be alright when you have a short distance to go, but I personally felt more safe on the 250. Its like I had enough power to get away and not be in the way of traffic. Didn't feel like everyone had to go around me on the way to work in the mornings.