BMW 6 Series Gran Coupe running costs aren’t going to be cheap, but they’re fairly reasonable for a car of this price point and size. The diesel version is the one to go for if costs are an issue since it had fairly low CO2 emissions equalling low VED. It also has the best fuel economy at 51.3mpg on the combined cycle.

Thanks to BMW’s Efficient Dynamics technology, the BMW 6 Series Gran Coupe emissions are the basis of some relatively impressive efficiency statistic claims. The green choice is the 640d, with CO2 emissions of 146g/km and fuel economy of 51.3mpg on the combined cycle. Choosing ECO PRO mode is the greenest way to travel, the car specifically targeting the required systems in order to save every ounce of energy possible.

Efficient Dynamics technology includes brake energy regeneration (with recuperation display), stop/start, electric power steering, low rolling resistance tyres, a detachable air con compressor and the employment of lightweight materials.

BMW 6 Series Gran Coupe reliability shouldn’t be a cause for much concern. The German firm has a record of building strong engines and mechanical systems, and the 6 Series hasn’t suffered much in the way of recalls or publicised mechanical gremlins.