I think this information is available through thier app. Try installing the 7eleven app. https://play.google.com/store/apps/details?id=au.com.fuel7eleven
You can't get all the info through the 7 eleven app, only whats cheapest in your specific area. I want to know the cheapest in Victoria.
Use the "store finder" from the drop down menu, it lets you check prices around the state by moving the map around. No full station comparison list though, it must be done station by station. I looked up around 20 station around town, 1.37 was the best i could find.