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The Enfield is a fine engine that does run at a much higher rpm than a typical industrial engine. As for economy the Kubota engine is used in the Centurion kit car. One such build featured in other posts broke 200 mpg at the Green Grand Prix a few years ago. As for manufacturing costs there are a number of factors that influence finished selling price. If one is looking for a smooth cruiser then a triple is a good choice, see Triumph bikes. For more throttle response on a canyon carver a lighter, higher revving engine is preferred. Gearing will match the torque band to vehicle weight and drag.
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