A national transportation-policy think tank says Indiana’s gas tax hike will actually save Hoosiers money. The Federal Highway Administration rates how good the pavement is on all the nation’s major roads. The Washington-based, nonprofit, surface transportation group – T-R-I-P or “trip — feeds that data into a formula to calculate how much roads wear down tires and hurt gas mileage. Indiana actually comes out better than all but three states in that calculation. But TRIP says it still costs 272 dollars a year to keep a car running after driving it on choppy asphalt.