Gas Prices Are Insane

I've been watching gas prices continue to free-fall with a mixture of glee, amazement, incredulity and (frankly) concern. Anything that falls this far, this fast, is bound to overcorrect. These prices are gonna go up again at some point.

Still, I like filling up at $1.34 a gallon.

What I don't understand is seeing gas for $1.41 at one station, then five miles later seeing it for $1.74. Can anyone account for the 33-cent difference? 

For that matter, can anyone account for anything at all related to the price of a gallon of gas?