Would you like me to upload the picture from my phone which has the date stamp on it? Gas Buddy also has the history, btw. Look at prices in Orland Park/Tinley Park/Homer Glen (all in Illinois) the last two weeks.
Yesterday I paid $2.78/gal in Morris IL on my way back from Starved Rock. Gas price by me is still $3.21/Gal as of this morning.
Sounds to me what you want to blame on “big oil” is the choices of a local station operator.