GasBuddy.com has just released  an analysis tracking a state by state trend showing what day of the week saw the cheapest gasoline prices. Most states showed the weekend as the best times but I've seen the prices start to go up on weekends.Check it out and see how some of the days have changed through the years.

http://blog.gasbuddy.com/posts/GasBuddy-Study-Finds-Best-Day-for-Motorists-to-Fill-Up/1715-562509-2244.aspx