[AceyMan]

The theory is correct, but the example is not the best: petrol prices are not as elastic as you'd think.

If I need to make a left turn across traffic or go around the block I'm not topping off at a station just for 5 cents/gal. (Tho, I might make a mental note & use that station when I'm coming down the other way, when it's easy to in & out.)

Los Angeles in particular is crazy. We have the equivalent to micro-climates with fuel prices. Stations a half mile apart can be 30¢ different. Stations a town apart can be 70–80¢ different.

And there are a couple of stations in Beverly Hills adjacent that are ~$2.50 more than the going rate (no surprise there, tho).