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KM is correct. Not only does the 11.3:1 compression ratio dictate 93 for optimine performance, it is also optimine fuel economy. The Bosch ECU is constantly pulling timing on 87 so the engine is not running at peak efficiency thus leass fuel mileage and less power.
Also, as these are direct injection engines, there is no benefit to the additives as no fuel passes the intake valves to keep them clean as in a carb'd or port injection engine.
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