Just a little reminder to all and sundry regarding petrol or gasoline.
Gasoline can be stored for around 6 months in a can - usually a specially designed light proof screw top pressure resistant type "spare gas" can as sold for the purpose of.
In a vehicle's gas tank it will be useable for around 3 months before it starts to deteriorate. The point where it becomes unusable I cannot determine but eventually it will to the point where it won't work in a car but you might be able to use it to clean something or light the bar-B-q but I wouldn't advise it.
So if the car don't start after 6 months - it could be the gas.
Remember - diesel owners. Don't stockpile diesel fuel as the summer stuff goes gooey and treacle like in winter and will actually freeze where the winter stuff isn't too good for summer use as it's too thin and that blended for cooler climates doesn't suit prolonged use hotter or warmer ones like Alaska - California or Southern Spain - Iceland.