Any vehicle will benefit from streamlining. The local Yamaha dealer's wife rides a 125cc and loves it. We are in a fairly hilly area. The routes you take will determine mpg as much as anything. Look at bicycle routes on the map apps. If you need more speed there are many parts to hot rod the 50cc. The most important engine efficiency feature is compression ratio. Come spring I will likely start work on a 50 cc Honda scooter for my son. In town 40 mph is fast enough.
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