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In-depth reviews

Mercedes GLS review - MPG, CO2 and Running Costs

This is a big, heavy car; even with a capable diesel engine it will cost a pretty penny at the pumps

There’s only so much a combustion engine – no matter how efficient – can do to offset the need to haul around a 2.5-tonne SUV. So while the 3.0-litre V6 diesel is a capable unit, at best it achieves 32.8mpg in official WLTP tests. Spend time driving in town and that number is likely to drop quite significantly. Despite the relative thirst, an enormous 90-litre fuel tank means that, should you match the official economy figures, the GLS will cover about 650 miles on a tank.

While the GLS is unlikely to appear in too many company car lists, its official emissions stand at 208g/km place it well into the top 37 percent Benefit in Kind tax bracket. The first year rate for private buyers is set at £1,280, though that’s a cost that will be slipped seamlessly into most buyers’ finance deals anyway.

Prices for the GLS start from just under £80,000 and climb to around £87,000 before options. That’s more or less on par with its closest rival, the BMW X7, although it has no directly equivalent engine (the X7’s regular diesel is less powerful while the M-badged version is significantly more potent) the BMW’s prices range from £74,000 to £91,000.

Insurance groups

With such a hefty price tag, insurance costs aren’t likely to be cheap. Groupings for the GLE head right to the top of the 50 classifications available, so a big budget will be needed beyond the initial purchase price.

Depreciation

Depending on the trim level, the GLS is predicted to hold between 43 and 49 percent of its value over a three year period. That’s some way behind the BMW X7, which holds at least 51 percent over the same time, with the strongest model maintaining around 56 percent of its retail price.

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