Date: Sat, 07 Apr 2007 01:11:23 GMT
From: "Walt Kienzle" <>
Subject: Re: Octane ratings.....what's the truth?

Gerry, FYI, and since nobody has mentioned it yet, 91 RON is about the same (within 1 octane point) as 87 AKI octane that your local gas station is pumping as regular in Canada. You might get better acceleration and gas mileage with higher octane, but if you don't need the acceleration and your engine spends more than a bit of time warming up because of cold temperatures, the low octane fuel is more economical. Wattenberg might be a bit off in the details (probably to simplify it for his radio audience), but I agree with his general philosophy. If you had an AERO, I might adjust my answer. That is were Wattenberg's "generally speaking" part kicks in. Walt Kienzle 1991 9000T "gerry" <> wrote in message >I know this is old stuff, but I would like some input (hopefully informed) > on current thinking, now that gas prices have skyrocketed and there is a > real financial significance that just didn't exist "in the olden days". > Here in British Columbia, Canada we are paying $1.17/litre in $Cdn or 1.17 > x > 3.785 (l. / U.S. gal) x .86/1=$3.80 U.S. / U.S. gallon.....and that's for > regular. Let's look at about $4.10+ U.S. / U.S. gallon. > The book for my car 2001 V70xc recommends a minimum octane (RON) of 91, > and > I see regulars at 87 and mid-range at 89. I listen to Radio Station KGO > (San > Francisco) at night and often hear their science Guru Bill Wattenberg (PhD > etc. etc. knows all, et al) who says, "If it will run on regular, use > regular. A modern sophisticated car engine may not run initially that > well, > but sensors will "re-tune" to the lower octane and will be > power effect on warranty. The theory, as I > understand it is that "higher octane" doesn't mean more "power" in the > gas, > it means elements added to adjust combustion rate. In his opinion higher > octanes are "generally speaking" a scam on automobile users perpetrated by > the oil companies and encouraged by the auto manufacturers. > > What's the consensus? > > Gerry > > > >

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