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"Jeff Strickland" <crwlr@yahoo.com> wrote:

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>
>You are throwing money away if you are in the habit of buying a higher grade
>fuel than is needed. The ONLY function of high octane is to prevent
>pre-ignition that comes from heat, compression, and/or advanced timing (or
>combinations of these maladies), or the normal function of a high
>performance motor. If your car can run on regular without pinging (pre
>ignition) typicaly heard under load and climbing hills at speed, then you do
>not need high octane fuel. Since most Toyota motors are not high compression
>engines, they do not need high octane gas. Your mechanic is telling you to
>use fuel that you do not need to use.
>
>Having said that, IF you need to use high octane gas, then you are having
>problems that the premium fuel is masking, or you have a Toyota model with a
>high performance engine.
>
>[/color]
Exactly right in all respects 'except' you're labeling 'ping' as
'preignition' and it isn't...ping is detonation (it occurs
'after' the normal ignition event...

'Preignition' is where the fuel/air charge is ignited 'before'
the normal ignition point and is much deadlier...

Just remember that 'preignition' and 'detonation' are two
separate, distinct and different occurrences...
--

-Gord.
(use gordon in email)