EFI service - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

11-23-2008, 02:15 PM

#20

rningonfumes

Drives: Yaris Sedan 5MT

Join Date: Oct 2008

Location: SoCal

Posts: 865

LOL.... "Research" does not mean for you to research. It's the full term.

Quote:

The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.

http://en.wikipedia.org/wiki/Octane_rating

Let's stop talking "tomaatoes and tomohtoes"... the point is.. don't let the dealor charge you for it, or at least so much for something so simple.

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