Hello, I used the search and found this thread Quote: Durability of petrol in fuel tankhttps://www.motor-talk.de/…/…n-im-fuel tank-t4695119.html?… After reading I’m less smart than before. The answers range from 6 months of durability to 19 years, at some point the OT came and from page 5 the first disputes How do I have to fill up my natural gas car when it consumes almost 0 gasoline. (Ergo the petrol only stands in the tank) In the end, it is only for the start-up processes and therefore hardly in the cost-wise sense of the word. Can I fill the petrol tank with a calm conscience or is it always recommended to keep the tank only over reserve, but to refill it more often fresh petrol? It’s about a Punto 188