The BMW 4 SERIES GRAN COUPE (2017-21) 420D 5DR GRAN COUPE 2.0 DPF SS 190 EU6 M SPORT AUTO8 is a premium, five-door hatchback with coupe-like styling, sitting between a family hatch and executive saloon in the UK market. Its wide-opening tailgate makes it more practical than its sleek shape suggests. Mycarcheck.com has recorded 5,455 checks across 2,179 different VINs, a substantial sample for this model. Checks show an average recorded mileage of 56,000 and about 1.6 previous keepers; the average private-sale valuation is £17,800. These figures are useful context, not a price guide for every car. With its 190hp diesel and smooth eight-speed automatic, the 420d suits commuters and families doing regular motorway miles, while its rear seats and boot manage everyday needs. M Sport adds a sportier appearance. Compared with Audi A5 Sportback and Mercedes-Benz C-Class rivals, it blends sleek styling, useful hatchback access and enjoyable driving particularly well.