Hello Dellino,
I am also not happy about having to heat with oil... I bought a house in a rural area, natural gas is not available, a pellet heating system is much too expensive to purchase, and everything else is difficult since it is not a new building. I am not an expert either, but (hopefully!) capable of calculating with rule of three, and if you convert to performance, i.e. kWh, and consider that one liter of oil provides about 10 kWh, whereas one liter of liquid gas only delivers 6.57 kWh (at a only slightly lower price, currently about 70 cents versus 66 cents), liquid gas is considerably more expensive! For me, about 900 euros annually. And that doesn’t even include the rent for the tank, which I didn’t even consider anymore with those numbers. For 900 euros I can already get two solid oil tanks of 1000 liters each, which have no follow-up costs. Natural gas corresponds roughly to that of crude oil. Of course, I can only refer to the data from the internet and for my place of residence (Münsterland). If you have a provider that offers you liquid gas at the same price as natural gas (but please calculate properly!) and the rent is so affordable that it really pays off, you are indeed lucky!
Best regards
Erika