Volvo V40 2.0T Built 99:Question on consumption

So far all the prima, super comfortable, good workmanship and a great design at a good price! Only the only catch would be the consumption with which I slowly start to doubt whether that must be so… As I said, I drive the car now since December and have initially pushed the consumption of ~13l (almost pure city traffic) to the winter and thus a little longer warm running phases. Now I drive every morning well 15km (Bund) it road) to my place of work and lie at ~11l with massively defensive driving mode (hundred at the line) and switch still before 2500tours. Even with slight acceleration (really carefully gas-giving) the consumption indicator rises quickly by the 20l or more!The tailpipe on the exhaust is also quickly lost although it almost does not require any oil, which could possibly be a sign of too fat mixture. Someone already had similar problem, or is all this normal and must also go to I am grateful for every tip! MfG VitaminG P.S.:Air filter is new