Power V70 1.6d Drive

Hello all! My Volvo V70 R-Design eDrive 115PS Diesel, MJ 2012 does not manage the specified top speed. It is entered at 190km/h, in fact, according to Tacho he creates just 180km/h, which according to GPS-Navi would only be real 174km/h. Therefore my friend addressed. He read out the engine data and told me that the car would have gone bad. I probably would not have kicked it properly, that’s what you can see from my “low” average consumption of about 6 l. Apart from the fact that this is not really low, I am not satisfied with the statement (I think understandable way). And it’s also not true… To supplement: Purchased at the end of September, mileage today about 14500km. What do you think you have to drive a car and make that so much up? Thank you in advance for your thoughts!