Max pressure listed on the tire will give you the best mileage and handling. too low for comfort and it can overheat and fail at highway speeds. Pressure listed on the VX is ONLY for stock size/brand tires and is most definetly a comfort number. Start with max listed on the tire and then decrease a few pounds if too rigid for you but I would NOT go more than 10lbs below that number on the tire unless you are crawling offroad.