Long distance – work car

Hello people, look for a reliable economical used car for 110km of work path. Of which about 15 federal / country road and rest highway up to about 5km of city traffic. So 15km overland, 35 highway and 5km of city. The car should not cost more than 3k Euro and be as robust as possible as regards the reperture vulnerability. The A and O is the fuel consumption for me. At a speed of 100-130 according to the speedometer on the highway I could arrange. But more like towards 120-130 k m/h ;-). The car should last as long as possible. I had thought the 200 Euro for purchase of one at some point new used including all necessary repairs, TÜV, tires etc should be enough per month or? Fuel comes of course separately. Greetings and thanks to all 🙂 Petrol or diesel I have no idea what is cheaper, especially with regard to the tax.