I think the topic has often been chewed through but I still ask, how much liter should an audi 80 b4 tdi with 90 ps be allowed to consume approx. in this cold season time. we have at the time temperatures from so -10 to -13 degrees and he needs average 8 liters on highway and land road (driving rarely in the city) without being overly strained. isn’t that a bit too high???? my car had since buying to the problem that it from time to time locked off until one from the ga spedal went and stepped up again. Consumption approx. 7 liters at temperatures of approx. + 15 degrees. a hose was leaking and now it funzes again, but now it comes to me that the sprite consumption has become higher, but it has become colder as already said. have my car only been a few months, therefore no experience!!