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I have always used the octane recommended in my car's manual (87) even if the engine has a rather high Compression Ratio (10.5:1). Modern ECU/ECM can easily manage lower octane with higher compression engines by adjusting the timing accordingly, to a certain extent. I might try 89 (E5) or 91 (E0) octane gas this summer and see if the ECM can advance the timing on its own for increased efficiency.
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