Compact cars up to 11,000,- Euro with a small loss of value

Hello, this forum has helped me a lot and since I’ve been researching for weeks and I don’t want to get any further I want to contact you directly now. Budget: up to 11,000,- (fortunately much less) Age: everything from BJ 2009 annual mileage and used: I live in the middle of the city, use the car from Monday to Friday, only to come to sports or go shopping for food. However, I am comming from Friday to Sunday (almost a pure highway route) and comes annually at 15,000,- km power: I like to drive on the AB approx. 140 km/h. So it would be important to me that the consumption keeps itself at this speed in the frame. Comfort: I do not need any special extras. However, it is important to me that the car on the AB is quite quiet, so well insulated. In one year I will most likely live in a German city and drive less German, possibly no need a car. It is therefore important to me that I have the wagon n can sell with as little loss as possible or buy me a petrol truck, which I can continue to use for urban traffic. Which models and above all which motorization can you recommend to me? Must it be a diesel?