First car which? Diesel or petrol?

Since I’m about to finish driving license, I’m of course already thinking about what kind of car it should be.My budget will be 2700 euros.I need to travel to the vocational school as well as to work.This means that the vehicle is moving every day.Route is about 45km, that is 90km in total.However, there is certainly something inside and so on.The vehicle should have comfort.Bin 1,90 and also wider so it should not be too small.Equipment should be Navi and air conditioning,leather a Navi since I don’t know the way to work by car and secondly because I often have to go to the main seat and turn to others.My work colleagues thought it should be a diesel with a maximum of 160ps because of the sprite costs. How is the peculiarly with the information inside out and so on what should be taken into account when it comes to consumption.Had seen a diesel from the outside only 8l but needs 12l inside the village which already sounds quite a lot.