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In the Mk4 Supra's case part of it has to do with whether or not your still running the stock computer. The stock computer automatically retards the timing with lower octane at high boost pressures. Advancing the timing with race gas should have a tendency to lean the car out some. Sunoco 100 octane I know is also oxygenated and this may have something to do with leaning out some also but don't know for sure.
 
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