There are lots of good reasons to buy gas at Costco. For starters, the lower cost helps you get extra value from your Costco membership-- especially if you have a Costco rewards credit card.

It's an easy way to earn extra cash back when you buy gas at Costco. This card has no annual fee, and it earns bonus cash back at restaurants, on travel, and at Costco. Buying gas at Costco is one ...