"People who are seeking gas rewards are looking specifically for a fuel credit card, " says Claire Hassert, spokeswoman for ExxonMobil.

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These cards use cash back, gift card or fuel credit incentive programs that are based the amount of purchases you make.

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The index tracks credit-card purchases of diesel fuel at truckstops across the country and provides a real-time indication of how much freight is moving from ports and factories to consumers.

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The strongest increases in fuel sales came in the midwest, where credit-card purchases rose 6.1% in May.

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If a car runs low on fuel during a drive, a user can pay for petrol using a company credit card that is supplied with each car.

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Offers vary by card so read the fine print to see if the incentive is cash back or fuel credits.

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