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Re: [St] Using Regular Gas In A Sprint ST



Caveat: if you feed an engine spec'd to use 91, the lower octane fuels often result in lower mileage.  I saw this on my bosses old Subaru Outback H-6.  He lost 2-3 mpg on 87.  On my Prelude, the VTEC motor would simply shut off the VTEC option if too much detonation occurred....which probably would have INCREASED my mileage.  :0)

Car and Driver www.caranddriver.com has an article from a few years ago on feeding various cars, with various octane requirements, various octane levels, and charted the results.  I think they used a Mustang, an Audi, and a few others.  They also showed how spoilers rarely help with traction unless you regularly exceed 100 MPH but hurt your MPG at normal speeds, but now I'm really off topic... 

Jeremy Witt
CNS Partners
http://www.cns-partners.com/
(o) 603-703-0399
(c) 603-475-4228


-----Original Message-----
From: st-bounces@xxxxxxxxxxxxxxxxxxxx [mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Neil Lindsey
Sent: Thursday, March 13, 2008 4:38 PM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [St] Using Regular Gas In A Sprint ST

yes fully agree, and by the same logic, higher octane DOES NOT give you
better mileage either

----- Original Message -----
From: "Jonathan West" <triumphnutter@xxxxxxxxx>
To: <st@xxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, March 13, 2008 1:09 PM
Subject: Re: [St] Using Regular Gas In A Sprint ST


> SNIP <

> The highest performance from any engine will come from the lowest octane
> fuel possible without detonating.  Lower octane fuels have a higher amount
> of stored energy .  The octane is used to slow combustion so that it does
> not fire prematurely and reduce flame travel.  It is false thinking that
> high octane fuels are for adding performance.  High octane fuels are
> required for high performance engines that use high compression ratios and
> lots of advance.  They are simply at a higher state of tune and require
> the high octane to survive, not to add performance.  In other words, it
> doesn't add horsepower, it maintains it at a given state of tune.
>
> SNIP <

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