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I second the Shell.....but IMO to see the best improvements, either use it all the time, or dont use it at all. I dont think a tank every now and again will make much of a difference.

Seen my MPG go up (a little), but my power delivery got smoother. Best way is to try a few tanks and see what you think.

I would stay away from the BP Ultimate tho...not as good as the Shell.
 
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