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I see it having more of an advantage on older cars like you said. Unless something is really wrong with your gas mileage (which the dealership should look at first), I wouldn't put in the F :)

And from experience, I used it in one of my older vehicles and had tons of deposits all of a sudden start showing up in the engine so I wouldn't recommend it.

What Fig said is right though, its not really worth putting in your engine when it has only a slight effect on gas mileage :)
 
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