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I noticed the same thing on my truck, could be all cars have a sweet spot because of timing issues etc, supposedly addressed by sensors , but they are not 100% accurate , especially true on older cars I would think, I think they call it sitting on the backside of the torque peak, so probably depends on gearing etc also often wondered about putting in a knock sensor and a switch to trick one of the sensors to advance timing in certain driving modes, arent most sensors variable resistors, except O2 's of course.
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