I never understood why our cars required so much tire pressure considering their size/weight. 38psi for 18 inch wheels with our sidewall height is probably a good idea to protect the wheel. I was always under impression that you add a pound or two based on your cars curb weight (especially in winter). So with our golfs at 3100lbs, recommended pressure should be anywhere between 31-33 (for normal size tires/wheels, like 16" winters') At least this is what I've done with my previous cars based on the info found on TireRack years... ago. Any reason (besides body/roll because race car) you guys run this much pressure on smaller wheels?