[Vwdiesel] Altitude compensation

[Roger Brown]

H . Hagar. wrote:
> I don't know, but I doubt very much there are high enough compression
> engines on the consumer market that REQUIRE high octane rated fuel. Higher
> compression gives higher burn temp, and more nitrogen emissions.  Lower
> compression gives less. I think the fuel requirements have more to do with
> running a more agressive timing advance curve, and leaner mixture to get
> better performance.  I would suspect as you do, that lower octane fuel in
> most engines would not be as detrimental to mileage in the majority of
> cases, regardless of altitude.
> -James
> 
> Hagar has a question  :   (or two) ? ---- I have to PLEASE the unusual sister
> Sigrid"  ----from sunland LA.---why ? my life depends on it.  Sorry to say that I NEED
> those two a lot more than they need me.
> 
> Sigrid has a 2001 ?  Passat gasser -- Q  :   is that an high compression engine
> ?----further is it OK to use 89 --octane ?  ----- Loren Sigrid own the  " THE VOLARE"  as
> well --am I permitted a couple of LOL ?.--and the Rabbit with all the needles (pine)---was
> my original dream. Now sleeping her life away " "Bunny      Blue".----------------1980
> 1.5L NA  four door deluxe made in Germany---nice round eyed girl.---BUT wrong color. -----
> Azure's Blau  ---  I want  Light Blue.(and a TURBO).

I have a 2.4L fuel injected engine in my Toyota 4Runner.
It has a fairly high (9.2:1) compression ratio and runs happily on 87 octane, as recommended by the factory:
	http://www.4crawler.com/4x4/4R_TechInfo.shtml#Engine
Have even run it on 85 at lower elevations and had no signs of pinging or reduced power.

-- 
    Roger