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To be efficient an engine doesn't need to be complicated.
I got my best car fuel economy with a Toyota 1KR-FE:
Went 1000 km with only 35L of gas, so 3,5L/100 km or 67 mpg in a totaly stock car.
That engine was an inline 3 cylinder with port injection, no turbochrager and generaly nothing special.
These engines are also pretty robust.
My best motorcycle fuel efficiency is with a Simson S51, wich has an ancient 2-stroke engine, takes some roughly 2-2,5 L/100 km.
Haven't actualy measured it precisely yet as I didn't ride much this year.
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