This was posted on another site FYI

70aarcuda said
Yeah..home track advantage, at mats too..

two time runs on friday ..beautiful morning...afternoon racing delayed due to high cross winds..

two time runs on saturday...stiff head wind and cold..

not time runs on sunday ...no wind and warm...

pick a dial in...
Click to expand...

Sonoma is the same way. You may think you have it figured out by Sunday but the changing conditions will keep you guessing. I have raced Sonoma for over 25 years and I have alot of logged data so i can usually dial our cars no matter what the conditions are.