Hi Ironbark
Yep some days are a good example of Murphy's Law , at least you didn't leave old unleaded in a car as long as I have ,on a couple of occasions I've had to throw the fuel tanks out because they were so badly corroded inside but it didn't bother me because I thew the car out with the fuel tank.
I still have about 30 litres of super fuel must be at least 20 years old ,last time I tested a small amount it was still flammable ,
it would be interesting to see if a mower would run on this old fuel.
Cheers
Max.