I live in The Netherlands, and Shell does sell the "FuelSave" gasoline here. I guess they started selling it here approximately a year ago. It replaced the normal "euro 95" gasoline and is sold for the same price.
Since I have a Shell service station around the corner, I regularly fill up there. Since the introduction of the FuelSave gasoline, I haven't seen a noticeable change in my fuel consumption... Also, when I use another brand of fuel the consumption doesn't really change...
So either it is just a marketing strategy, or the difference is too small to notice..
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