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"Too high" compression if real will lead to excessive pinging and the need to use premium fuel at all time. The knock sensor would be constantly retarding time to account for almost constant tendency to pre-ignite.
My first assumption is the gauge is off or the testing method was flawed. The last possibility is that it has be driven by an old lady only on Sundays 3 miles to church and back. Never rev'ing an engine and never allowing it warm up will lead to carbon build up which can lead to high compression.
An Italian tune-up may be in order! If not, water torture!
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