Inflation here? gas/grocery prices just continue to climb

You know why gas prices are so quick to jump and slow to fall at the station? It's because gas has the lowest profit margin of anything on the market. The margins are so low, credit card companies are making as much as the gas station on the sale of fuel. I find it incredibly ironic that Americans birch about a company selling a product at less than 5% mark up but then walk inside the same store and buy a 20oz bottle of water for $2.