January 19, 2007 The words Mini and Cooper go together but have traditionally been associated with powerful petrol engines – so prepare the system for a shock because the famous brand is about to have a diesel variant. The Cooper D boasts performance and fuel efficiency from an all-new 1.6-litre 110hp turbodiesel powerplant that promises to be the most fuel-efficient and cleanest MINI ever built. In comparison to the outgoing MINI One D’s combined fuel consumption of 58.9mpg, the Cooper D is capable of 64.2mpg.