Saw a station yesterday with diesel at $2.829 a gallon. My car was low so I pulled in and filled up. I was across town for an appointment and looked at every other diesel price I came across travelling home, maybe 20 places. The lowest I saw was $3.159. I bought the fuel at a Sinclair station and saw two others, one at $3.299 and the Flying J truckstop at $3.559. What would account for this significantly lower price at a single station do you figure?