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I honestly believe it would worth to try the 2-stroke again, and eventually set it to regular production. The most obvious advantages are that 2-strokes can be made lighter and more compact than a 4-stroke in the same power and torque ratings, but there are also other practical advantages that can be taken into account. They're already one step forward regarding fossil fuel independence, since the use of vegetable-based lube oils (mainly Castor oil) is already widespread among 2-stroke engine enthusiasts, and since the usual practice with 2-strokes is to allow the oil into the combustion process, it reduces eventual risks associated to unproper disposal of waste motor oils. A notable mechanical advantage reflecting on the overall fuel savings is related to the lower internal frictions.
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