Used vehicles for 3000 (including registration, etc.)

Good evening people, I know that there are already several issues and I’m sorry that I open a stove again. However, I’m running out of time. I’m coming from the Frankfurt area and I’m about to start my training, which is 40 KM away, which is why I decided to buy a car. Unfortunately, my wallet doesn’t allow too much, which is why my pain limit with all the incurred costs is at 3000 €. But for this money, the car has to also My biggest problem is that everyone in my environment wants to give me some great tips for buying, sometimes they agree, but often they don’t. I know that the answer will not be unanimous here either, but I hope for advice and suggestions from you as experts. The route consists of 60-70% highway and the rest is downtown. It’s important to me that the consumption in the inner city t doesn’t go over 12 L, because I’m travelling around the city some time in my free time. PS shouldn’t be too much, but I also think it shouldn’t be too little I imagine something about 100 HP, but I’m open to suggestions. I’d be happy about plenty of answers or about helpful references to other Therds. Best regards and thank you already