Sixt - Fuel Crisis - If it happens how will it affect us?

I am due to pick up a car over the Easter bank holiday weekend from a major airport location and I will be dropping it off at a different airport location 4 days later.

I need to know

Will all sixt cars come with full tanks?

Will I be able to pre pay for my fuel, effectivly taking the car back empty?

If I dont prepay what is the penalty for not refueling, eg due to every petrol station being full of cars or run out of fuel?

I will be able to do my journey on a full tank.

Which part of the world are you talking about?

Which part of the world are you talking about?

If you were in the location you would know about, I am refering to the UK.