Small car or compact class, 11-12k, new used cars up to 3 years

Servus together, I am currently driving a FoFi mk7 1.25l with 82ps which I like in terms of space and design, but the motorization is not sufficient. I have driven it since 02/2015 and have so far driven 7000km, the consumption with the greatest possible fuel saving effort is approx. 6.4l, whereby the driving fun remains completely on the track or the consumption for 82ps exorbitantly high. However, the mileage will increase next year (from approx. August) the exact number can I My budget is about 11,000 – 12,000 € with the sale of the car. The new car can be a used car & up to 3 years old. Now to my driving profile: – approx. 40% city traffic – approx. 30% highway – approx. 30% highway petrol or diesel, I don’t care. The main thing is that the car has more passage and I also have time on longer motorway rides quickly & not too much consumption. Since I happen next year I am not sure if it will be a small car (possibly again Fiesta with 1.0 Ecoboost) or a compact class (Focus o.E.) with more space. What would you advise me to do? Thank you Chris