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Running hotter does typically increase efficiency, 20% seems a bit high to put squarely on operating temperature change. Perhaps hotter under hood temps also caused a warm air intake effect.
The reason mfg's don't go much hotter than 200 is thermal expansion and oil degradation. The metal parts push on eachother more at the same time the oil life is being reduced. Perfect recipe for destroying an engine for 80% of vehicle owners who dont maintain ther vehicle properly.
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