IF you are using good quality gas like Shell on each fill up, you should not have to add fuel additives as they have detergents in them already. If your engine is running smoothly you are waisting money using those additives.
Just because you find gas without ethanol doesn't mean it has the best cleaning agents in it. If you are not running gas that has cleaning agents added (like Chevron or Shell) I would occasionally run a bottle of Techron to keep deposits from forming. Chevron was putting Techron in their gas long before ethanol was ever added.
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