Diesel or Beziner

We like the CX60 very well. I drove with the 163 hp diesel years ago and I liked it already. We like the space and the higher seating position. New car is not in question. Budget for a used car is max. 28,000 EUR. On various portal you get good vehicles for this (from BJ 2013). Now we are faced with the choice: the car would drive less during the week, d a it serves my wife preferably to get from A to B (shopping etc.) and if we have to go somewhere in the evening. Every 3-4 weeks a longer ride comes to my old home (150km, 150km back). On the weekend the “normal” trips would come to it. I start from 10-15 TSD km a year. Now the question: diesel or gasoline? Is it still today that diesel vehicles have to be moved “a lot” or is it enough if the engine is blown free every few days? In the case of diesel, the low consumption appeals to us. In addition, the models 160 – 215 hp speak to us. Disadvantage: Purchase price is higher. The gasoline we found only start at 245 hp and accordingly the consumption is also. In the purchase they are however again cheaper! This offer interests me, or is the price unbelievable? See here: Oh, it should be automatic! How would you decide?