The point of an aerodynamic small-engined scooter is to sell in an environment where small engines cost less in road tax, in insurance costs, and where it may be possible to ride them without a seperate motorcycle licence or when still too young to drive a car. In other words, Europe. The aerodynamics are there to appeal to younger riders, and to keep the rain off mature owners who have so far always driven cars and are not used to real weather. It's a cultural thing entirely: gas mileage has nothing to do with it. The point of big-engined cruisers, on the other hand, is so that the motor turns more slowly at a given speed and gives a relaxed and economical ride along with long engine life, which in a consumer society obsessed with this year's model is a point often ignored. The point of in-line fours is to provide acceleration above all other considerations, and assumes that fuel is a cheap and endlessly renewable resource. Therefore both cruisers and scooters will have a place in the future, but inline fours are approaching the end of their period of supremacy. Since you are in the US rather than Europe, stick with your Nomad and make it last.