Been driving for 30 years. I use bargain gas only and never had a problem. My 2008 JKU I bought brand new still runs like a top at 165k miles with only the cheapest gas I can find.Jesus, this debate has been held thousands of times on every single fucking car forum I have ever been on. If the vehicle manufacturer specifies the fuel for your vehicle that is what that specific vehicle requires. End of story.
Also, if you care about your vehicle don't run bargain brand fuels. Run mid or high level fuels at the manufacturer specified octane levels. They literally spend millions of dollars to test for the optimal fuel for the engines in their vehicles.