Two tall adults will have room to spread out in the front seats, while another two adults can sit in decent comfort in the back seats. There is a central rear seat, but it’s narrow and occupants have a large transmission tunnel to contend with. Six-footers will find their heads near – but not brushing – the ceiling, and their knees clear from the front seatbacks. Overall, rear space is similar to the rival BMW X4 and better than in the Porsche Macan. Of course, if you do need more headroom, there’s always the regular GLC, BMW X3 and the Audi Q5.
All GLC Coupes come with four decent-sized door pockets and front passengers benefit from a large cubbyhole beneath the front armrest, as well as a sizable cubby for keys and wallets beneath a flap in front of the infotainment rotary controller .
The GLC's boot matches the Porsche Macan’s for on-paper space, but the Mercedes’ sloping rear roofline makes loading tall items more difficult. The Macan’s more squared-off design makes for a more practical luggage bay. If you really are sold on the fastback design, the BMW X4 is a little bit more commodious in the boot.
Should you need to fit a really long item in the GLC Coupe, the rear bench folds in a handy 40/20/40 split. However, there’s no sliding or reclining rear seat to allow you to choose between maximum load space or enhanced rear passenger comfort.