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I have read many times years ago about using ceramics on the head and piston tops to help reduce heat loss in the combustion chamber during the combustion stroke helps to improve mileage. I have not read much about it lately. It does make sense, if you can keep a little more heat during the power phase of the cycle you get a slightly better improvement in power and mileage. Maybe studies have shown that it isnt durable or worth the investment, I have not heard. Maybe something to look in to.
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