I've posted before that I believe that some gas stations change the prices highest left to right to get you to accidentally buy the most expensive gas http://justacarguy.blogspot.com/2011/09/do-some-gas-stations-try-to-trick-you.html
above are the reversed from normal levels of price gouging at the Chevron, and below, in the normal arrangement, is the Valejo gas station prices
above are the reversed from normal levels of price gouging at the Chevron, and below, in the normal arrangement, is the Valejo gas station prices