Free $10 gas reward card from BP

BP has a new promotion called Thank You Days.  Fill up with 8 gallons of BP gas five times and they will send you a $10 Reward Card for your next gas purchase. I guess they are trying to extend some goodwill after what happened last year. Details and instructions here.  When you pay with a credit card that give you significant cash back on gas, such as the American Express Costco True Earnings card, which gives you 3% back, this could turn out to be a worthwhile deal.

Hat tip to MyMoneyBlog.