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On my reasonably flat commute I average around 16 mph on my road bike, but your average speed is dependent on many different factors. A general rule of thumb is that if you are switching from a mountain bike with knobbies to a road bike you will be between 15-20% faster at the same watts/effort.
What size engine can go 5MPH, all engines on bikes and scooters can do that. I have a 49cc scooter that could only do 33 MPH maximum, but my state MVB says that the most I'm allowed to go is 30 MPH.