Costs and real consumption: Mercedes C 300 d station wagon

The 60,000 euro Mercedes C 300 d station wagon comes to the consumption check.

Why should you drive a diesel today? When the zeitgeist punishes him with contempt and the world rescue lobby slanders him as an air polluter? If we ran through the village after every hysterical sow, we could start pondering. But as car activists, we stick to the economical, yet anything but fun self-igniter. Of course, we also register the liter prices at the gas station with incomprehension, which suggest racing fuel, when only a kind of premium heating oil is bubbling at the diesel tap. ,

With the C-Class, Mercedes focuses on general efficiency. Which, on the one hand, secures the environmental chapter. On the other hand, it manifests the manufacturer's efforts to rethink and optimize a vehicle as a whole, even in areas that have so far remained unexamined in comparative tests, i.e. in which one could not strive for plus points. Now. It marks an attitude to go further, to push oneself more than is necessary. And what about the fuel and maintenance costs?

Our test consumption

Mercedes specifies a WLTP consumption of 5.9 liters of diesel per 100 kilometers for the C 300 d Estate. He moves away from this value in everyday life. We have determined an average consumption of 7.0 liters, which causes fuel costs of 11.90 euros per 100 kilometers. On the Eco lap, the Mercedes consumed 5.2 liters while consuming 6.9 liters on the commuter route. If the Mercedes was moved in a sporty manner, consumption increased to 9.0 liters. The fuel costs are calculated using the daily updated fuel price on our partner portal refuel more (December 22, 2022 /diesel: 1.70 euros/litre).

Monthly maintenance costs

If you drive as resource-efficiently as we do on our eco tour, you reduce the fuel costs for 100 kilometers to 8.84 euros. The rather violent gait results in a sum of 15.30 euros. The vehicle tax costs 306 euros per year for the Mercedes, the liability insurance is 449 euros. Partial and fully comprehensive insurance cost an additional 150 and 893 euros respectively. Monthly maintenance costs of 331 euros are paid by those who drive the Mercedes 15,000 kilometers a year. If the mileage is doubled, the sum increases to 589 euros. We leave out the loss in value in this calculation.

How to test

The auto motor und sport test consumption consists of three differently weighted consumption runs. So-called “commuter consumption” accounts for 70 percent. This is a journey from home to work, which averages 21 kilometers. A particularly economical, approx. 275-kilometre-long eco-lap is included in the rating with 15 percent. The remaining 15 percent is accounted for by the sports driver lap.The length is roughly the same as the eco lap, but the route includes a larger proportion of motorway and thus higher speeds on average. The basis for calculating the fuel costs is always the price quoted on the "more tanken" portal on the day the article was created.

The monthly maintenance costs include maintenance, wear part costs and vehicle taxes assuming an annual mileage of 15,000 and 30,000 kilometers without loss of value. The basis for the calculation is the test consumption, a three-year holding period, no-claims class SF12 for liability and fully comprehensive insurance with Allianz including discounts for garage parkers and the restriction to certain drivers (not under 21). At Allianz, SF12 offers a discount rate of 34 percent for liability and 28 percent for comprehensive insurance.


In the auto motor und sport test consumption, the 60,000 euro Mercedes C 300 d station wagon with 265 hp ended up with an average value of 7.0 liters of diesel per 100 kilometers. This means that the fuel costs for this distance are 11.90 euros. The monthly maintenance costs are 331 euros (15,000 km annual mileage) or 589 euros (30,000 km annual mileage).


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