Oct 16, 2014
I started by tracking price movement between my trip to and from work to figure out the ideal time to fill up. I quickly learned that Tues/Sat/Sun never spike and Friday is very rare too.
Then I learned where to find the data by following DI's posts. I regularly track the average minimum selling price, using the midday and end-of-day V-grade change in Group 3. Just like DI, I monitor difference between retail and the calculated price in hopes of predicting what happens in the days ahead. I also like to follow AFOS's updates on the Chicago board; he provides similar advice as DI.