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<learnfpga@gmail.com> wrote in message
news:1144938466.694318.68220@i39g2000cwa.googlegroups.com...[color=blue]
>I dont think it is gas. Considering you have 170K miles on it and never
> had a CEL its just normal wear and tear. Oxygen sensor is what mostly
> causes the problem and I think just replacing it would solve your
> problem.
>
> However I do have doubts over quality of gas. My mechenic recommends I
> use higher quality gas like 91 even though my camry can take 87. I dont
> kow how much it really affects the peoformance of the car and life of
> engine. May be someone can shed some light on it. Thanks....
>[/color]

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.