I use Citgo. Mainly because they offer 87 with no ethanol, plus its the closest gas station to my house. I haven't come across another station in my area that offers 87 with no ethanol, they only offer it in 93.
They aren't listed as a top tier brand, but according to their site they exceed EPA standards and add detergents.
"CITGO TriCLEAN Gasoline meets and exceeds Environmental Protection Agency requirements. CITGO provides three different octane grades of gasoline – complete with our proprietary high-performance detergent additive."
Anyone have any input about Citgo?