Wow
Pretty cool and it works. I found it a few weeks ago by accident.
It takes a week sometimes to get the $$$ posted to Your Account. But they will do it.
Also if You do the deal that Shell has (IIRC <$0.20> a gallon) it’s a separate deal so one could get like $0.50 a gallon or more off between the two.
There’s also discounts/rebates on Convenience and Grocery Stores as well.