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I would use some 600 cc bike engine and built a supercahrger system there if you want to use bike engines. If you already choose engine with most torque on the lower revs it will be more reliable in daily usage.
Propably cheapest and the most best FE would come from VW lupo 3L engine which is 1.2 TDI. That smart engine would be also nice but it might be more expensive.
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