octane baby!

[treed2 at u.washington.edu (T. Reed)]

Yep, that's what I was going to say!

And even if you had 11.5:1 compression, higher octane gas doesn't do
anything for you unless you advance the ignition timing to take advantage
of its antiknock properties.

So in summary: if your engine is not knocking now, and doesn't knock under
load when you advance the timing, you don't need expensive gas.

-Toby

On Sun, 14 Sep 2003, Dan Bubb wrote:

> Rumor has it that higher octane gas has less energy content per unit volume.
> i.e. higher octane gas will give you less MPG.
> In any case it certainly doesn't have 10% more energy per unit volume to
> make it cost effective.
> Use high octane if you need it. The JH doesn't.
> A JH with 8.5 CR will be happy with the cheapest swill available at the
> pump.
> Dan
>
> ----- Original Message -----
> From: Dan Smith <sad_rocc@yahoo.com>
> To: <scirocco-l@scirocco.org>
> Sent: Sunday, September 14, 2003 6:27 PM
> Subject: octane baby!
>
>
> > Yeah, a corny play on a song title, but I couldn't resist. Anyways, CO has
> octane ratings at the pump ranging from 85 to 94. With gas prices ranging
> from $1.77 to 1.99 respectively, I want to see if I can settle this hot
> debate among my housemates. Does higher octane gas equal better gas mileage?
> And enough of a better mileage to make it cost effective? This would be for
> my relatively stock 84 8v, which doesn't deserve high octane gas if it
> doesn't make a difference mileage-wise. When responding, please try to keep
> the formula equations to a minimum as high school chem was a long time ago
> and I just squeeked by.
> >
> > TIA,
> > Dan
> >
> >
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