Next car Porsche?

Good day, and I have been driving for two years through reasons – which I do not necessarily want to carry out in detail here – a Dacia Sandero 1.2. Now I have looked around in the area Porsche a little and have noticed that these do not cost the world when shopping (Porsche Boxster BJ2000 145’km 220hp petrol facelift for 15 giants). My questions relate to possible repair costs, further costs, how many kilometers I could drive with an entire tank filling and if e s Makes sense to upgrade to gas. Now another question, are there diesel alternatives to Porsche or is Porsche replaced by “nothing”? I thank you in advance for all the answers. MfG Dawud