Data: Volvo C30 (the small so, 2-door) Diesel 2.0 D Km-Stand: just over 100,000 Hello, I’m not sure if the consumption of 7 liters in winter is normal for a diesel. I think it’s a bit too high, even if the month for the small car is quite large (2 liters of motor). But “questions costs nothing” and maybe you have an idea how I could reduce the consumption a little bit. Well, I’m one of the tussies that drives “wildly”, i.e.: fast journeys, high speed I also don’t drive long distances every day, until work is 15km (simple). On weekend times highway routes to blow the turbocharger “freely” ;-). When I bought the car 2 years ago, the average consumption was 4.7 liters. And that in winter, say: in January. And in the Allgäu it’s not really cold in winter – in contrast to my region, I’ve got a change of oil regularly (for a diesel, but still: more often than recommended oil change with best oil), I wouldn’t have a change of fuel. And I don’t know how to change of fuel.