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Like I said, I can only speak for my own car on this matter (since I've done a significant amount of research), and other owners have seen significant improvements simply by increasing the ignition timing across the various load and rpm ranges. These improvements include increased power, smoother power/torque curve, and increased mileage (as much as 20% in some cases).
Again, the best course of action would be to check car-specific forums for more information on car-specific tuning. There is probably a significant amount of information on Japanese cars in particular, and the reason for that is Japanese tuners have a tendency to focus on ignition timing for performance tuning (as opposed to most American tuners who focus primarily on seeing how much more gas they can flow through the engine).
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