Yesterday on a trip where I would expect to use about 5 litres per 100 km in the summer I was actually using over 7. Winter temperatures, winter tyres, snow & ice on the roads, car covered with ice & snow ... it all takes its toll. This car (Merc A series) seems particularly bad for getting ice building up on the rear of the car, on the hatchback. Just the weight alone is significant, plus any effect on air flow.
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