Similarly, Gas Buddy and Local Gas Prices can come in handy to help locate the cheapest gas prices in a given area for regular, midgrade, premium and diesel grades.
They also examined estimated fuel costs according to U.S. Environmental Protection Agency mileage ratings assuming 15, 000 miles a year, using factory-recommended fuel--that is, regular, premium or diesel--at today's prices and weighted for a realistic mix between city and highway driving.