There aren't many places in Baton Rouge that sell gas without ethanol. The only place I know of for sure is Ride USA on Airline Highway. Right now regular is $2.99 and the Gas Buddy app doesn't give a price for premium there.
Baton Rouge UNBRANDED 87 89 92 Airline Super Express 10174 Airline Hwy 2015-01-24 details Baton Rouge CONOCO 93 Friendly Food Mart 225-275-7132 12617 Florida Blvd 2014-08-14 details Baton Rouge CHEVRON 87 Hit-N-Run 225-379-7634 2313 S Acadian Thwy 2015-03-14 details Baton Rouge UNBRANDED 87 92 La Express 16970 Jefferson Hwy 2014-05-19 details Baton Rouge UNBRANDED 87 Tiger Express 300 Lee Dr 2013-09-06 details Baton Rouge UNBRANDED 87 University Car Care 2801 Highland Rd 2012-12-01
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Some people are delusional about premium. I talked to a guy yesterday who told me he uses premium in his Ford Fiesta. Its a waste money.
Acura test most of their cars with plus, gets better mileage, but will run on regular. The car computer adjust it to run on regular.