GasCards

The best gas cards combine generous rebates and industry-standard interest rates. In our ongoing series examining the best and worst credit card offers out there, we ask: Does American Express' Blue Cash Preferred card measure up?

Rather than driving five miles out of your way to save a penny or two per gallon, you can generally save between 3% to 5% on gas if you keep the right credit card in your pocket. At $4 a gallon, that's the equivalent of 20 cents off per gallon. Even if gas goes back down to $3 per gallon, you are...