14mpg is about 6km/l, which is the mileage for city driving. If rural driving is almost the same as city, it is correct...Just purchased a 2011 Tiguan 2.0 TSI only to find out it's getting 14 mpg in rural driving. Changed spark plugs and it didn't improve much. Has anyone had much success with cleaning carbon buildup off the intake valves? Does it make much of a difference?