Yes, Costco gas is generally considered better than Arco. While both types of gas come from the same source, Costco’s gasoline meets Top Tier standards, a program between manufacturers and gasoline retailers to provide higher-quality fuel with enhanced additives and detergents [6].
Costco’s gas has a higher level of detergents than federal standards, making it excellent quality [4]. Additionally, Costco’s gasoline exceeds EPA regulations for additives and detergents, offering better quality than required [5].
