After you hit the $ 7,000 limit, you'll earn 1 % back on fuel purchases for the rest of the year. (wisebread.com)
However, there is a caveat — the credit is limited to the first 100 gallons of fuel purchased during that billing cycle. (rewardexpert.com)
You didn't mention whether you need cards exclusively used for fuel purchases or a general card that will allow employees to pay for other purchases, too. (creditcards.com)