have you checked your local laws for motor bicycles? 20mph is I think the slowest speed limit out of any state, most states see a 20mph motor bicycle as a biycle, not a moped, but as I said check you laws, my state it' 30mph and all you need is the city $3 bicycle registration sticker.
150mpg sounds about right, my two stroke moped gets just over 100mpg and has wide small tires.
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