I keep an ear/eye on the news and top off whenever there is a sign of stuff about to hit the fan.
We had lots of advance warning that Harvey was about to hit the Texas Gulf coast. The logical conclusion from prior experience with tropical storms is that they may disrupt the oil infrastructure.
In the absence of news, I keep an eye on http://www.dallasgasprices.com/ and fill up when there is an indication of a coming price spike or if the price appears to have bottomed.
And then there is this We had another earthquake this morning - #6 by artg_dms showing that Talk sometimes does have a positive benefit.