At the beginning of a trip, the mileage odometer read 56,20056,200 miles. The driver filled the gas tank with 66 gallons of gasoline. During the trip, the driver filled his tank again with 1212 gallons of gasoline when the odometer read 56,56056,560. At the end of the trip, the driver filled his tank again with 2020 gallons of gasoline. The odometer read 57,06057,060. To the nearest tenth, what was the car's average miles-per-gallon for the entire trip