Dacia Stepway, diesel or gasoline?! Real price?

Hello all together, I’m about to get a Dacia Stepway. Now I have 2 questions. 1) is the diesel worth compared to the petrol? Since both of them swallow almost the same amount and the diesel costs about 2000 € more in the sleep I think that’s a good question. I once looked on the internet for such a computer and they say that the diesel is more lonesome, however the Daen always go there on a sandero only. My mileage in the year would be about 25t Km. Because 2000 € first time drive out where the diesel and gasoline prices are almost the same, not so easy? I don’t have much idea of cars, so allow me the question. And the 2 question is. What is a realistic price that you pay for a stepway? No matter if gasoline or diesel, both should get sound climate and elector as well as spoiler and rehling? I have seen on the net so much for a deisel with above characteristics for about 13,000 €. What do you say? Thank you for your help.