Adi, you can also consider grabbing some Liqui Moly Petrol Stabiliser.
I cant remember the exact name, but it is designed to prevent fuel from going off, as well as stabilising the fuel when the car stands for long periods of time.
The Franschhoek Motor Museum used to buy boxes of this from me and they loved it.
My dad uses it in his motorbikes (his Buell is 4 years old with 2200km on the clock and often stands for over 6 months at a time with no issue) never had to drain a tank, just start and go.
Perhaps something to consider. :thumbs: