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Ecky I have to disagree with you. OEMs leave a lot of room for improvement. My focus on improved FE has been modifications on engine internals. I've been able to achieve 65% gain in FE and 25% improvement in power. (Green Grand Prix Chev S10 38mpg and LSR Aug 1,2010 Loring AFB 105.6 mph) The low hanging fruit is 100% cylinder sealing and reducing heat rejection rate. Lower emissions also. How it was done is in my yet to be published book.
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