Wanna know something about petrol going off?

It goes “off” as in out of spec. Not unusable. Not even *bad*.

The trout is on the same tank I last filled it with in June 2025. It runs fine.

I had another Falcon that sat from 2001 to 2009. Ran fine.

Maybe less power, or lower mpg. Couldn’t tell.

A really finely tuned engine control computer might complain, might throw codes. It might be really noticeable on a high compression or high performance engine.

But the mad max wasteland will be fine.

@NanoRaptor Data point: I inherited my dad's old (gasoline-powered) Chevy Silverado a number of years ago. Not having a need or a place for a large pickup truck and being a chronic procrastinator, I promptly parked it in a vehicle storage yard and let it sit completely unused for ~4 years.

When I finally got around to getting it ready to sell, I had a dead battery to contend with... but once I got that going it started up and ran just fine.