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nearly every car I've owned has a learning ECU that learns over ~100ish miles the engines natural tendencies and adjusts its fuel, timing, throttle, etc... settings around this so as to maximize emissions, economy and power. This is part of the reason why when you unplug the battery and clear the CMOS "memory" your car won't pass inspection, it needs go through several drive cycles to settle out.
I don't see how the ECU could get permanently "locked" into settings after 100 miles. What happens when you reflash the car just due to a regular ECU update?
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