Gasbuddy.com provides the cheapest gas prices in an area within the past 48 hours. Local gas prices for regular, midgrade, premium, and diesel fuel can be searched by state, city, or zip code. The address of the gas station, along with a map is shown. Other locations in the area are shown for comparison shopping. A trip cost calculator can be used to get the cheapest prices for gas along a trip route. A gas price chart shows the historical price of gas nationally over an eleven year period. Mobile apps are also provided for most cellular phones.