Having worked on fuel systems for about 30 odd years I can tell you this, this is an incredibly completive industry. The companies look everywhere for pricing at their competition, information comes from dealers, wholesalers and people that just drive around while they are working checking prices and reporting in. It is a pretty thoughtful process, people will drive out of their way to buy fuel 1 cent cheaper per gallon. Watching people buy fuel for over 30 years I've seen things at gas stations that were unbelievable !Not only do I find that very odd, I've also noted that when the price does change, it changes literally everywhere at almost exactly the same time...down to the minute. WTAF.