Need to distinguish between cash and credit prices

Im not a big cash person. I carry only my credit card all the time. Some has stations have low prices for cash and higher prices for credit card purchases. If this app can have an additional filter for card vs cash, thatll be more helpful. Otherwise I see a good rate, go all the way just to find out that is cash price and I dont have cash.

Suryava about Gas Guru: Cheap Gas Prices, v1.8