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The ones that do work simply do so by bumping octane. Our local fuel is, by government mandate, E10. Many E10 blends locally have terrible RON. Many of the local cars are Korean or Japanese, and are optimized for 95 RON fuel and suffer when loaded with 92 RON with E10. Knock is not an uncommon problem over here.
Fuel savers that bump RON by that much tend to show up on the dyno and actually show a little improvement in efficiency on cars that typically gain efficiency with 95 RON, anyway.
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