Currently reading: Mercedes C-class fuel tank shrunk to supermini size
A standard 41-litre fuel tank is partly responsible for some of the weight savings quoted on the new Mercedes C-class
2 mins read
5 February 2014

A significant portion of the new Mercedes-Benz C-class's weight savings have been made possible by a tiny 41-litre fuel tank, it has been revealed.

As much as 16 per cent of the average 75kg saved by the new W205 generation of C-class over its predecessor is attributed to its small tank. Industry sources say this move is an example of how car manufacturers are using every possible engineering and legislative tweak to reduce the CO2 ratings of their new models.

By shrinking the standard-issue tank by 18 litres, Mercedes has managed to shave almost 12kg off the official kerb weight. Under EU regulations, a model’s official kerb weight is calculated using a fuel tank filled to 90 per cent of its capacity, as well as an additional 75kg for the driver.

During official NEDC fuel consumption tests, the petrol-engined C-class was filled with just 36.9 litres of fuel at the start, compared with the 53.1 litres carried by the previous-generation C-class. Although the small fuel tank allowed the benchmark C-class to be lightened by less than one per cent, it was clearly considered a worthwhile move by Mercedes.

In Germany, the new C-class is sold with an optional 66-litre fuel tank, for which Mercedes charges €59.50 (about £49). In the UK, this 66-litre tank will be fitted as standard, but official figures will be quoted from the European standard and the 41-litre tank. 

A Mercedes spokesman said: “We have reduced the fuel tank capacity of the new C-class roughly in line with the fuel savings it offers over its predecessor. For those customers who place a priority on range, we offer an optional 66-litre tank.

“The reduction in weight of the new C-class has led to a significant improvement in payload capacity. This is up by 50kg and is now 90kg higher than the competition.”

The new C-class will go on sale in the UK in June, and features an all-new cabin with technology derived from the new S-class, as well as a range of economical engines offering under 100g/km of CO2 emissions on some models.


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5 February 2014
So, Mercedes has basically taken a short cut, even cheated, towards its weight saving measures. I personally would want a fuel tank that is as big as possible just to avoid visiting petrol stations frequently, while a smaller tank may catch you out if you're in an area where petrol stations are few and far between. If Mercedes' engineering really was thorough, they'd have found another effective weight saving measure.

5 February 2014

That all UK car's will have the 66Ltr tank.........?

5 February 2014
You should never get caught out being low on fuel,unless you live in a Country where Towns are hundreds of miles apart in which case you'd carry a couple of 5Ltr cans of spare fuel which wouldn't happen in good old Blighty,so, at least in this Country there no excuse other than you weren't paying attention to the fuel gauge or the buzzer warning of low fuel.

5 February 2014
This is as old as the C-Class W205 unveil. Slow news day?


5 February 2014
For intercity autobahn munchers I can see the reason for wanting extended range over the previous version; for everyone else (and the retired doctors buying this for shopping trips in the UK) lugging around a few less litres of fuel just to avoid an extra filling station visit a month is no big deal and will improve their economy a fraction...

5 February 2014
"In the UK, this 66-litre tank will be fitted as standard." So they haven't changed anything for UK cars? All a bit of a non-story then. I'm sure lots of manufacturers have different specs globally.

5 February 2014
scottMerc wrote:

"In the UK, this 66-litre tank will be fitted as standard." So they haven't changed anything for UK cars? All a bit of a non-story then. I'm sure lots of manufacturers have different specs globally.

A bit of a non-story? A total non-story as far as UK is concerned and where not standard elsewhere it's a cheap-ish option anyway

5 February 2014
.....that would compell me to want the larger fuel tank, its the need to fill more than once a week. The economy of my A1 TDi is great, but doing a 150 mile a day round trip to work means I'm filling my car every 4 days and thats with a 40 litre tank and my car averaging a realistic 54mpg on a mix of motorways, dual carriageways, A and B roads during each journey. I don't think an extra 3-4 litres of fuel would affect the weight of my car enough to bring the economy down in a way that outweighs the benefits of only having to fill once a week. I'd essentially get 675+ miles out of a tank as opposed to ~525 miles at a cost of approx £4 more per fill.

5 February 2014
Right its all becoming clear, Mercedes are on a diet in the name of CO2 and economy, but it is making life hell for my A-Class its been in for endless rattles, lightweight brittle plastics rubbing against each other, a dim witted gearbox which has just had a software update that you only get when you complain so the service manager says which appears to have seriously affect the fuel economy, 24mpg on last 10 mile trip....yes the gearbox is now like semi sport in eco mode and a real nutter in sport with a 5700 hesitation...i am waiting for mercedes to tell me exactly what they have done to my gearbox, they are keeping very quiet. 250miles on a tank....should i really have gone petrol?

5 February 2014
This ranks right up there with the manufacturers downsizing engines to turbos just to get mileage figures which the buyer will never realise. The tail is wagging the dog....again.


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