Skip advert
Advertisement

Mercedes S-Class (2014-2020) review - MPG, CO2 and running costs

Despite the high purchase prices, the S-Class needn't cost a fortune to run

MPG, CO2 and Running Costs rating

4.2

How we review cars
RRP
£100,290 £247,845
Find your Mercedes S-Class
Compare deals from trusted partners on this car and previous models.
Or are you looking to sell your car?
Value my car
Fast, no-nonsense car selling
Value my car

With prices starting comfortably in excess of £72,000, the S-Class isn’t exactly cheap to buy; and, if you get a bit friendly with the options list, the price can rise to well over £100,000. However, despite the price tag, the S-Class shouldn’t cost you the earth to run.

Under the official testing regime, the S 350 d returns more than 50mpg and emits 139g/km of CO2, while the S 500 L averages just over 40mpg, and even the S 63 returns 32.1mpg. The S 560 e mild-hybrid is claimed to be the most economical, returning 113mpg. Those are impressive figures, given how big the car is and how fast it can go.

Depending on how you use the car, of course, those figures could be very different. The economy will certainly plummet, if you delve into the available performance, for example. 

Insurance Groups

Insurance for the S-Class range starts at group 46 for the S 350 d, and goes up with your potential to go faster. The S 500 is in group 48, and the two Mercedes-AMG models are in group 50. That may look pretty hefty, but in fact the groupings are no worse than for comparable models from BMW and Audi. 

Depreciation

All luxury cars have a reputation for losing value on an epic scale. If ever that’s not true in relative percentage terms, then it certainly is in terms of hard cash. The basic principle seems to be that the more you spend on your new S-Class, the more you stand to lose when you sell the car on.

Advertisement - Article continues below

In best-selling S 350 d form, though, we think the new S-Class should match the previous model’s 44 per cent residual value after three years.

Skip advert
Advertisement

Which Is Best

Cheapest

  • Name
    S350d L 313 AMG Line Premium 4dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • RRP
    £100,290
Select car

Most Economical

  • Name
    S450e L AMG Line Premium 4dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • RRP
    £112,145
Select car

Fastest

  • Name
    Maybach First Class S680 4Matic 4dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • RRP
    £221,150
Select car

New & used car deals

Mercedes S Class

Mercedes S Class

RRP £100,390Used from £79,900
Volkswagen Golf

Volkswagen Golf

RRP £24,625Avg. savings £2,271 off RRP*Used from £12,700
Volkswagen Tiguan

Volkswagen Tiguan

RRP £35,385Avg. savings £2,919 off RRP*Used from £15,100
Renault Clio

Renault Clio

RRP £16,160Avg. savings £2,721 off RRP*Used from £8,800
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

New Volvo EM90 2025 review: the ultimate SUV killer
Volvo EM90 - front

New Volvo EM90 2025 review: the ultimate SUV killer

Volvo has made an ultra-luxurious van. Intrigued? You should be, but sadly it’s for China only
Road tests
16 Jun 2025
New Peugeot 208 GTi: electric hot hatch gets stunning looks and plenty of power
Peugeot E-208 GTi - reveal front

New Peugeot 208 GTi: electric hot hatch gets stunning looks and plenty of power

Hot Peugeot E-208 gets racier styling, 276bhp and does 0-62mph in just 5.7 seconds
News
13 Jun 2025
Car Deal of the Day: Kia Sportage at £255 per month can’t be anything but popular
Kia Sportage - side panning

Car Deal of the Day: Kia Sportage at £255 per month can’t be anything but popular

The Kia Sportage has earned its popularity over the years and deals like our Car Deal of the Day for June 14 won’t do it any harm at all.
News
14 Jun 2025