May 4, 2011 No Comments Free Sweet Leaf Tea or 20 oz. Dr. Pepper at Murphy USA Complete the app to get your coupon for a FREE Sweet Leaf Tea or 20oz Dr Pepper. Plus, get coupons for up to $2 off a $10 purchase of gas. Locations. Free Sweet Leaf Tea or 20 oz. Dr. Pepper at Murphy USA – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.