2006 model Peugeot 407 1.6 hdi manual fuel

Friends, my problem is that the vehicle is on the long road or in the city, the consumption of fuel lt changes on the road computer, sometimes it becomes 4.5, sometimes it goes up to 20 lt, and the numbers can not cause constant movement. And with the full tank I bought from opet from 3.80 TL, it made 900 kilometers including the inside and outside, usually outside of the city. It was normal for me, it was 1 month since I bought the car. he didn't eat gas in the queue, it was as if he was going to stop.

is there anyone to answer

First of all, Jesus is the answer to your first question. Normal, the constant change you need to bring the average fuel consumption of 100 km. secondly, fuel consumption varies depending on the condition of the engine. How long has the vehicle been with you? fuel consumption varies depending on turbocharged air hose hoses, leak-injectors and filters. Meanwhile, when the light was on, the man made 900 km. If you stopped, did you start as soon as you started the vehicle. if so it could be. I suggest you wait 1-2 minutes and act like that. and clean the throttle.