LOS ANGELES — GasBuddy, the popular app for finding the lowest prices on fuel, has a new proposition, aimed to save more money at the pump.

The Boston-based app introduces a new payment system Monday that promises to shave 5 cents off each gallon of gas pumped at most gas stations in the United States.

GasBuddy is introducing a gas payment card, tied to your checking account, which automatically deducts gas purchases from your bank balances at 5 cents per gallon lower than what's advertised on the pump. Thus, if you fill up with gallons at $3 a gallon, the $30 charge would show up as $29.50.

Depending upon how much gas you put in your vehicle, and how large your car is, you could save anywhere from 50 cents to $1 per fill-up. GasBuddy says most consumers will save up to $340 yearly, via the new payment plan.

However, fans of loyalty credit cards might not be excited. Because the GasBuddy program connects to your bank checking account, it thus eliminates the opportunity to pay with credit card loyalty cards.

Many loyalty cards are paying $1 to $2 per mile for airline trips, which could average from 50-200 miles monthly, and that helps add up for free plane trips.

GasBuddy says the new card is accepted in 95% of gas stations nationwide, including top tier brands like Shell, Mobil, Exxon and Chevron. The exceptions are Costco and the Arco gas stations in the Southern California area. Both tend to have lower prices than the top brands and both have their own mobile payment systems. ARCO's is a loyalty payment card, but doesn't offer a discount for using it, while Costco has a private label credit card with 4% rebates at the end of the year on gas purchases.

Payment is via the card only, for now, GasBuddy says, and will eventually offer payments via it's popular app, which has over 70 million downloads.

GasBuddy has evolved in the last year to go beyond just gas listings. It now wants to be the Yelp of gas station land, as CEO Walt Doyle explained to us on a TalkingTech podcast interview.

"We've redesigned the company to embrace the convenience store and broader market," he says. "It used to be about finding the cheapest gas. Now it's about the perfect pit stop. If you need those honey dew donuts, we can show you where they are."

GasBuddy makes money by selling its data about customer likes and dislikes to the station operators, who historically make most of their profits on food and beverage items, with gas as the lure to bring them in.

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