Just bought an E Class Cabrio E220d 2016 with 3,200 miles on clock from dealer. Beautiful to behold but the mpg they talk about is a long way from the 32mpg I just got on a full tank. Mixed driving, motorway, busy dual carriageway, a little fast driving, much slow driving with stop/start. Far cry from the 54mpg they told me about. Anyone got experience of decent fuel consumption?