backstory is that i try to fill up my tank more when gas prices are at a low and less as prices go up to make my long term average cost per gallon lower.
now given current events, and empirical reality, gas has only been going up and will continue to go up. we could assume different curves(only constraint being that price per gallon goes up as time goes forward), but if you buy your gas now you will spend less money then you have if you bought it tomorrow, day after, or week down the road. my estimate is that it will be month minimum before it gets cheaper.
now that I have put this out there into the world you should fill up asap, I already filled up before making this post and other people will come up with this idea independently of me.
Does gas station gasoline usually have a lot of ethanol …? And what does “goes bad” even mean for an oil-based product?
Depends on the state but usually yes. Gas station gas has all sorts of different things in it that turn to “varnish” if left to sit. Also the ethanol is hygroscopic meaning it absorbs water from the atmosphere.