I think for the winter you can cover the whole area. Or if you want to be on the safe side you should cover those vents on the sides and leave the central one opened. IMHO
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Quote:
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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