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Brrr, it's cold today.
It's good that you can now quickly turn on the heating for the seat and steering wheel in the car in winter and the view remains clear through a heated windscreen.
But such extras are reflected in fuel consumption, and that can be a mess, as the ADAC explains using examples.
The rule of thumb is: For every 100 watts of power, drivers have to expect around 0.1 liters more or plus 0.1 kilowatt hours of electricity per 100 kilometers.
For example, a gasoline engine has a heated windscreen (800 watts of power) with 0.8 liters per 100 kilometers.
With an example price of 1.40 euros per liter of fuel, that's 1.12 euros.
In an electric car, the additional consumption from the battery costs 25 cents (at 31 cents per kilowatt hour).
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The seat heating (100 watts) warms the buttocks for 0.1 liters (14 cents / three cents for an electric car) more.
Charging a cell phone or a mobile navigation system (ten watts) costs 0.01 liters (one cent) more per 100 kilometers.
The steering wheel heating (50 watts) consumes 0.05 liters from the tank (seven cents) or extra electricity for two cents from the e-car battery.
Heated exterior mirrors (40 watts) increase consumption by 0.04 liters (six cents / one cent).
Standard functions also increase fuel consumption
But standard functions also increase consumption: A ventilation set to "medium" (170 watts) swallows 0.17 liters (24 cents / five cents), low beam (125 watts) costs around 0.13 liters more (18 cents / four cents) .
For example, if you switch on the heating units for the windscreen, seat, steering wheel and exterior mirror and charge your smartphone at the same time, you consume one liter (one kilowatt hour) more per 100 kilometers.
If you want to save your wallet and the environment, you can switch off unnecessary consumers.
However, drivers should never save on safety-relevant things such as lights and windshield ventilation.