"robert parker" <roberthparke-@xxxx> wrote: original article:http://www.egroups.com/group/dmcnews/?start=7339 Is there a difference in octane values between U.S. and Europe? Here in Holland, the only fuels we can get are 95 and 98 octane; this seems a huge difference. Maybe they use a different formula over here.. Rob. > Yep, I've had that discussion before... The 91 is the "anti-knock index" > that is recommended for the 87 octane. I talked to a fellow in the Texaco > office about the Octane vs. anti-knock index. Octane rating is the > comparison of volatility of a particular grade of fuel to the volatility of > the 8-carbon, single-bond chain "Octane". It is derived from a formula of > (R+M)Squared/2, which is used in the U.S. The DMC is a low compression > engine, thus the lack of need for a higher octane rating. Check the manual > again.(U.S. version).