The difference in a road bike is the shoulder height and the shape of the fork. Homemade aero bars work on flat bars too. The large diameter tubes on the suspension fork can be shaped using strips of foam insulation. If a mountain bike is what you have to work with or prefer, then use it for now. All bikes benefit from streamlining.
Johnny Mullet's speeds match what I get on my commuter bike, Jamis Arragon 700c.
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