Not satisfied to show off its hypermiling credentials in Australia and the UK, Peugeot is showing off that its compact 308 HDI can spot great mileage in South Africa. A 308 participated in the Coast2Coast challenge running 1689.7 km from the East Coast city of Kleinzee to the West Coast city of Umhlanga - on a single tank. The average fuel consumption of the car was just 3.4 liters for every 100 km. That translates to 69.15 mpg U.S. The model was a standard 1.6-liter 110 hp model fitted with a Diesel Particulate Filter and Peugeot's automatic double clutch gearbox, named EGS6. Standard emissions from this car are 120 g/km of CO2, so it's got that going for it. If you think that proving 308's efficiency required an expense and polluting event, well, at least the Challenge Coast2Coast decided to offset its emissions by planting trees in Orange Farm, south of Johannesburg.