Gary: I'm fixing to order some new rear PS2s. The front tires have about half their tread life left. However if I order four tires by May 31 I may qualify for the Michelin $500 travel discount card promotion. Do you have any specific info on this? Discounts on what? If I could get $500 worth of gasoline I would order four tires now, essentially getting the front pair for free. But if the card simply gives me a 10% cut at some luxury resort I'll just buy the rear set. Tried to research this on your site but the information on the actual benefits is vague.