I Investigated 7 Gas Station Chains — Only 3 Are Actually Safe for Your Engine

You pull into whatever gas station is cheapest or closest, fill up, and never think about it again. Here's what almost nobody knows. Not all gas is the same, and the difference isn't the octane, it's the detergent. Some chains meet a higher standard that actively keeps your engine clean, others don't. Out of 10 chains people use every day, only a few are held to that standard, and the cheap one you love may not be. The difference isn't the octane, it's the detergent.