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You seem to be caught on the 38% number, but what of the ones that are rated higher? How about the VAG engines from VW and Audi? And why does the efficiency of very large engines exceed that of smaller ones? Here is a related question to that... Why will a 3 cylinder 1.2l typically have a better thermal efficiency than a 4 cylinder of same size? I would say that there has been a good amount of discussion on why we havent seen this 54% theoretical efficiency, and I dont know what you are looking for in our answers as this is at least the second time you have asked this after getting many answers.
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