my question is to what extent do tempreture affect the AFR's? Say i tuned my car for 12.1:1 AFR under boost on a warm afternoon, about how much generally would it lean out by when i drive in a cool evening? i'm assuming only around .3-.5AFR difference.

 

from my personal experience. .3 to.4of a difference between a nice hot day to night time driving.

 

So does anyone have a rough idea of temp drop vs. points in AFR change? Like for every 10 degrees drop in temp it changes .3-5 in Afr?