The stock sonata tires that I have are the Hankook optimo h437s. On the door panel there is info on tire specs. The info said the front and rear tires should be at 36 psi. I've heard that higher is better (to a certain point). I couldn't find what the max tire pressure was for these tires. Should I keep it at 36 psi or should I maybe keep it one or two units higher?