Even the petroleum people will tell you that 80 percent of vehicles using
the higher octane don�t need it.  Very few auto mfr require the higher
octanes and some others only need it under certain conditions.  There used
to be a risk of damage with too high or low of an octane but most vehicle
computer systems using knock sensors can adjust accordingly.  Just about
every car made in the US and Europe is made to run on regular unleaded low
octane.  However some parts of the country have 87 as low and others have 85
as low.  You may have to adjust accordingly.
jimt

On 8/6/05 7:41 PM, "Bob Stevens" <mtbiker62@HOTMAIL.COM> wrote:

> This caught my interest from another list. I'll be going on a long van trip,
> maybe 2K mi (Salt Lake, Denver, Glacier). Think I'll run a little experiment
> regarding cost, mileage and performance. Most of you probably don't use 91
> anyway, but I have been due to the TIICO.
> 
> http://www.washingtonpost.com/wp-dyn/content/article/2005/08/05/AR200508050159
> 5.html
> 
> bob
> '87 Westy Syncro
> 
>