Good news for travelers hitting the road this holiday week. Gas Buddy says it’ll coast a bit less to fill up. The average U.S. price of regular-grade gasoline has dipped 3 cents per gallon to $2.66 over the past two weeks. The highest price for a gallon of gas is found, of course, in California where the average price 3.41 a gallon. Closer to 4 dollars in San Luis Obispo and Santa Barbara Counties.