I'm worried about the full tank of petrol in my stored car during lockdown. Should I drain it?

I do not expect to use my car for another three weeks due to the coronavirus lockdown. It has already been stored in the garage for three weeks. I'm following your guidelines regarding over-inflating tyres...

What's the best quality petrol and diesel to use?

What is the best premium fuel brand for petrol and diesel?

Is there a future for diesel cars?

My 520d Touring has been 100% reliable over 9 years / 65,000 miles from new - just needed routine servicing and a battery. I've been planning to replace it with a new 520d Touring but worry that diesel...