Costs & verdict
Everyday costs, plus how reliable and safe it is
You also get a lot of equipment for your money, including keyless entry and start, heated front and second-row seats, 22in alloy wheels and a head-up display which projects key information onto the windscreen to reduce the need to take your eyes off the road.
That said, you might want to consider stepping up to Premium + trim, because this brings massaging seats, heated armrests and semi-autonomous driving tech that’s designed to take the strain out of driving when it comes to adjusting your speed, steering, changing lanes, braking, or moving off in traffic jams.
Unsurprisingly, the GLS is in the top BIK company-car tax group. Meanwhile, its official average fuel economy is 35.8mpg, which is beaten by all diesel versions of the X7 and Audi Q7, but does better the 30.4mpg of the similarly powerful Range Rover SDV8.
The GLS is too new to have proven its dependability, but in the 2019 What Car? Reliability Survey Mercedes finished 24th out of 31 manufacturers – behind Volvo (11th), Audi (20th) and BMW (21st), but ahead of Land Rover (last).
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