We will do the same as those going on essential journeys.
One weekly journey of 10 miles in a car which starts with a full tank will last a very long time, probably well over three months.
3 months =13 weeks x 10 miles = 130 miles.
I doubt there is a car on the road, unless you drive vintage or veteran cars, whose petrol tank has as little capacity as that. Most petrol tanks have a mileage capacity of as much as 300 miles. So the petrol now in the tank will also cover an extension to the three months.
I appreciate that some people need to be in social seclusion or shielding and driving is out of the question, but the thought of millions of people of all ages taking to the road all at once not having driven for 3 months or more, in cars that have not been used for three months and should have a full service before being driven, is actually quite frightening.
I am spending three months in my home strictly social distancing. I intend to enjoy every moment of it and I will make full use of all the possibilities this offers, including taking each car out for a short run each week to keep it operational and my driving skills sharp. If other people want to turn this period into a form of righteous martyrdom, that is fine, just do not include me.