In every region, fuel prices are up compared against the week before. Gasoline is increasingly more expensive than diesel fuel per gallon. The national gasoline average is now about a $1.50 below the price this time last year. Despite the increase in price, diesel fuel is now $2.45 below this time last year.

For insight into the climbing fuel prices, read: "Why gas prices are going up."

National retail fuel price averages

Regional regular gasoline prices

Source: Energy Information Administration, 5/25/09. Figures rounded to the nearest cent.

For more information on saving fuel see our reports on how to get the best gas mileage and where to find the cheapest gas.