where as I feel I pay 2-5% less when using a card. Target and Amazon are both 5% off using the right card, vs 2% on a generic cash back card. Gas is 4% off on

where as I feel I pay 2-5% less when using a card. Target and Amazon are both 5% off using the right card, vs 2% on a generic cash back card. Gas is 4% off on the costco card.