I purchased 4 tires from Big O tires- don't know the exact date of purchase- receipt is in my car. I am supposed to get $500.00 worth of free gas by sending in $100.00 per month in receipts along with the vouchers. I have kept careful track of when I have sent them, and when I should have received my gas cards, and I have not received one gas card! I started sending receipts in July of 2008, it is now December. I called them in October, and there was an automated message saying that if my receipts were sent after July 25, to give them... read full review »