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If a car has been tuned when it's 70 degrees F outside, and you run it on a day that's 50, how does this affect the air to fuel ratio under full boost / WOT? What if it's 100 out that day?

Guessing, I would think that the cooler weather would result in a higher A/F (leaner), and the hotter weather would result in a lower A/F (richer). Or am I backwards?
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