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There is reason for optimism on engine efficiency improvement when you look at all the threads on possible new engine designs.
opposed piston, MCE-5, revetec , VCR etc. All have potential for big steps forward on the effciency. It looks like that the new engine solution will more complex than we see today in our engines. Allthough looking for instance at a Toyota prius , you cannot call that real simple, but it works nice due to good electronics.
Maintenance and DIY on more complex new designs will not be good, but ofcourse efficiency prevails.
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