Thanks for the link!
Why are they doing this only in California? The fact that it is specific to
our home state makes me suspect some silly new laws or social engineering
going on behind the scenes. . . yet they don't say _why_ they are doing
On the surface it would seem counterproductive, as all else being equal
(though it usually is) 3.5% less fuel economy would mean roughly 3.5% more
pollution. Their own tests confirm this:
Why oh why would somebody who wants to make air cleaner, require gasoline
formulations with lower fuel economy? Perhaps the pollution generated is
chemically different as to be less harmful to the environment? But doesn't
the car's EFI compensate and simply run a richer mixture? That would seem to
undermine the entire purpose of the oxygenated fuel.
[mailto:email@example.com]On Behalf Of David Rowney
Sent: Monday, July 30, 2001 09:58
Subject: Re: 91 octane gas
Ethanol increases octane, but lowers the energy content of the gasoline
Chevron is going to 91 octane also in California.
At 09:17 PM 7/29/2001 -0400, you wrote:
>I only noticed 91 at 76 stations for a few weeks now. Ever since I have
>going only to Chevron.
>I thought I heard somewhere that because they are adding more ethanol, it
>lowers the octane rating. Someone care to comment?