New car, what diesel?

Good day, I will be selling my Ford Fiesta JH1/JD3 in the near future, because it consumes too much fuel (since the 15 inches mature almost exactly 8.2l on 100km) and I think I get cheaper with a diesel. (I drive about 20,000km a year). First of all I have to say that the wallet is not quite so loose with me. My budget is 250€ – 3000€ and I don’t care if it has a lot of space or not. It doesn’t have to be very fast either, nu With my Ford Fiesta 1.3l 60hp this is unfortunately always an agony, as many people can certainly think. I drive only 3km to work every day and for my purchases maybe 2km, meaning short distance. If I visit my girlfriend, however, it is 25km per trip. I speak both city and cross-country distances. I am currently looking at the Volvo V40 BJ 2000-2004 1.9D. What do you stop from the model? W What should I pay maximum? I am personally open to everything as long as it is a 4/5 door. Greetings