If the intake air is comming in less than 32 degrees your engines pc will compensate air/fuel automatically. My GA runs best in -40c/-40f outdoor weather conditions and my intake temperature drops below -45c. I have to let it run to warm up before ripping or it can make it run crappy. I used a indoor/outdoor thermometer to test intake air in different conditions. Hot days to cold days here in canada. I guess Im saying I disagree with temperatures affecting the a/f cus like i said the pc compensates for those changes.