gas cards

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?

Our first collection of readers' gas-saving suggestions looked at methods to help you cut Next, we covered methods for squeezing extra miles out of every tank. This time, DailyFinance looks at discounts and other ways that drivers can actually pay less for each gallon of fuel.

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...