So biofuels and detergents are different. Mobil’s order detergents in their fuels. I believe it makes a difference, and isn’t better or worse than adding a can of additive in each tank. Detergents definitely improve engine performance. I always avoid mainstream stations like Wawa, Circle K (not Shell, just Circle K), Speedway, most major truck stops don't have additives, 7-Eleven, Racetrac, Thornton’s, come-and-go etc.
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