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My wife's Mietek - MB W168 has the same setup with Webasto that is using diesel fuel for heating coolant when temp drops below 8c. Definitely it helps to keep the engine warm. Can't say if it helps global FE or not, haven't tested it yet. I'll thry to get some numbers though when cold days will come.
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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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