We are reluctant to see that oil hit $100 a barrel Wednesday and gasoline prices could soon top their all-time record from last May of $3.22 a gallon. Considering the oil prices are still rocketing high, it’s necessary to get a nice gas card to save more on gasoline. Here are some recommendations for your reference. All of them are annual fee-free.

American Express SimplyCash^SM Business Card (★★★★★) You can absolutely get 5% cash back at all of the gas pumps without any limit. The cash back will be credited to your account every month. You don’t have to wait until you get enough rewards amount. Plus you can get 5% cash back at office supplies and wireless services. This is a business card. The usage of this card will not report on your personal account.

Citi Driver’s Edge Options Platinum Select MasterCard (★★★★★) You can get 6% cash back at gas stations, supermarkets and drugstores in 12 months. This is why I give this card five stars. I’m pretty sure that you can save a lot by using this card in the first year. Another feature is you can get $1 for every 100 miles you drive. You can convert the cash rebate to ThankYou Points at any time.

Discover® Open Road^SM Card (★★★★☆) You can get 5% cash back at all of the gas stations with your first $100 every month. If you spend $150 every month on gasoline, you can get 5% cash back on the first $100 and 0.5% from the remaining $50. If your monthly gasoline consumption is less than $100, this would be a nice card for you.

Chase BP Visa® Rewards Card (★★★★☆) You can get 10% cash back for any gasoline purchases made at BP gas stations in the first 2 months. And after that, you can continue to get 5% cash back at any BP gas station. If there are many BP gas stations in your area, this is a nice card for you. Another reason why I recommend this card is you can easily get this card from Chase. The drawback is you can only get 5% cash back at BP gas stations.

Shell® MasterCard from Citi (★★★★☆) You can get 5% cash back for any gasoline purchases made at Shell gas stations without limit. The drawback is you can only get 5% cash back at Shell gas stations.

TrueEarnings® Business card from Costco and American Express (★★★★☆) You can get 5% for purchases of automobile gas (effective December 01, 2007, any individual Purchase transaction in excess of 75 gallons or equivalent dollar value will not be deemed to be a Purchase of automobile gasoline) at Costco Gasoline and domestic stand-alone gas stations, excluding gas purchased at warehouse clubs other than Costco, superstores or supermarkets. For example, if you fill your tank at Wal-Mart gas stations, you can’t get 5% cash back. But you can get 5% cash back at BP or Shell gas stations. You can get 3% cash back at restaurants and 2% cash back for traveling.

Chase PerfectCard™ MasterCard® (★★★☆☆) You can get 6% cash back on gasoline purchases for the first 90 days. After that you can only get 3% cash back.

Of course, there are many other store branded gas cards like CITGO, ExxonMobil and Phillips66 card from many credit card issuers. You can find out more at their websites.