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Winter diesel is a bit thinner that summer one so it probably have slightly less BTU. But it shouldn't affect FE so much. Maybe there's something wrong with your engine or car? Check brakes, tyres pressure, air filter etc.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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