91 octane tuning best boost

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Anders

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I live in Sweden and have an imported 2007 eddie bauer expedition (an excellent specimen). Me, my wife and the racing dogs just love the transport!!!

Kalmar3.jpg

A Day ay The Races, the blue one is my girl (club master 2012)


Im a bit curious about chip tuning.
EU 95 octane = US 91 octane ... could someone recommend the brands that will give me the most boost in milage? Or maybe on the other hand more boost in power/torque?
(1 gallon=8 usd in Sweden...)
 
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