Survey: 6 best gas rewards cards

We know that carpooling and driving slower can help to save gas, but if you're constantly driving and want a more convenient way to ease the pain at the pump, gas station-affiliated credit cards and generic gas credit cards may be worth considering. With gas prices back above $4 per gallon in some parts of the country, Cardhub.com has released a timely list of the best gas reward credit cards on the market.

Pentagon Federal Credit Union Platinum Cash Rewards Credit Card
This card offers 5% cash back on gas purchased at any station, as well as 1% cash back on all other purchases. You must have a PenFed membership ($15) to be eligible for this card.

Blue Cash Everyday from American Express
Earn 2% cash back at gas stations and department stores, 3% at supermarkets, and 1% on everything else. There's no annual fee and for now, you can earn a $100 bonus for spending $1,000 in the first three months.

TrueEarnings Card from Costco and American Express
Receive 3% cash back on all gas purchases up to $3,000 (1% thereafter), 2% at restaurants, 2% on travel, and 1% on everything else. You'll need a Costco membership ($55).

BP Credit Card
Get rebates of 10% for BP gas, 4% for travel and dining, and 2% for everything else for the first 60 days. After that, you get a 5% rebate for BP gas, 2% for travel and dining, and 1% for everything else. There's no annual fee.

Marathon Credit Card
Offers a 25-cent rebate for each gallon of Marathon gas you buy during the months when you spend at least $1,000 on the card. Get 15 cents back for spending between $500 and $1,000, and a 5-cent rebate for spending less than $500. This card does not have an annual fee.

ExxonMobil MasterCard
This card offers a 15-cent rebate for each gallon of ExxonMobil gas as well as up to 2% rebates on all other purchases up to $10,000 in annual spending and 1% thereafter. No annual fee.

Also from MoneyWatch: What's driving up gas prices?