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15 seconds is my waiting time, because my car's manual asks for it. my car switches to open loop with a hint of throttle or switching from park to neutral/drive. so i do that too.
i have noticed that my instant highway MPGs stay in 26-30 for first 15min after super cold starts no matter what i do (car is in closed loop and 14.5afr). then they improve to 31-40mpg after that depending on speed. anyway doesnt matter since i don't do any highway driving anymore.
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