I have stock rims and i run about 35-37 psi on the tires. During a long run on the highway the pressure reads 37. Cold it's 35. I use nitrogen. I have michelin pilot sport a/s tires. Tires are fine. Good grip, ride, noise level. They're all wearing on the edges which suggests I need to add more air. Is this normal? What are you guys with stock sizes running?