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I have to wonder how long before the self serve stations start charging less due to the lowered operating expenses from not having to pay someone $12/hour to pump gas.

At one point, the attendant would at least have to be able to make change.

Now all they have to do is swipe a card.

Around here they do usually charge less. There will be stations with both options and the self-serve pumps are a dime cheaper.

But we see huge variation from town to town.

Here in Michigan we see a huge variation in price, but it's over time, not necessarilly from station to station.

Over the last year or two prices began regularly jumping by $0.20-$0.30/gallon in a matter of hours.