I drove the 86 900 SPG about 2,500 miles (4,000 km) two summers ago, down the west coast (all main freeway) of USA, a week of city driving in southern california, then a drive up the west coast (scenic coastal freeway), probably averaged 75 mph, with A/C on... total calculated mileage was 30.2 MPG ( 7.79 L/100km) To be fair though, this specific car 'only' has 160,000 miles on it.