Effect of premium gas

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Old 27 Aug 2005, 02:50 am   #1 (permalink)
Sharx35
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Default Effect of premium gas

Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
unleaded gas, per the manual. The manual mentions how I could get "improved
performance" using Premium gas. I stand to be corrected but, here in Canada,
I believe the usual 3 grades of gas available are rated 87, 89 and 91 on
some kind of octane scale. Last week, when the tank was close to empty, I
refilled with Premium gas. This week, when THAT tank was almost empty, I
again refilled with Premium gas. So far, I haven't noticed any improvement
in performance, i.e. it ran great before, it still runs great.

QUESTION: How many consecutive tankfuls of a different grade of gas does it
take before the computer in the 99 Camry "retrains" to the different octane
level?


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Old 27 Aug 2005, 08:38 am   #2 (permalink)
MUADIBŪ
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Default Re: Effect of premium gas

The performance it refers to may be in MPG, not in power or speed. It
is not unusual for a car to get a little better gas mileage with
higher grade fuels, but it's never a significant amount of difference
either.
Also when performance "power"-wise is increased there's more to the
equation................generally upgrade to consumer level fuels will
have almost no increase in power.


>Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
>unleaded gas, per the manual. The manual mentions how I could get "improved
>performance" using Premium gas. I stand to be corrected but, here in Canada,
>I believe the usual 3 grades of gas available are rated 87, 89 and 91 on
>some kind of octane scale. Last week, when the tank was close to empty, I
>refilled with Premium gas. This week, when THAT tank was almost empty, I
>again refilled with Premium gas. So far, I haven't noticed any improvement
>in performance, i.e. it ran great before, it still runs great.
>
>QUESTION: How many consecutive tankfuls of a different grade of gas does it
>take before the computer in the 99 Camry "retrains" to the different octane
>level?
>




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Old 27 Aug 2005, 08:40 am   #3 (permalink)
ST185
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Default Re: Effect of premium gas


Sharx35 Wrote:
> Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
> unleaded gas, per the manual. The manual mentions how I could get
> "improved
> performance" using Premium gas. I stand to be corrected but, here in
> Canada,
> I believe the usual 3 grades of gas available are rated 87, 89 and 91
> on
> some kind of octane scale. Last week, when the tank was close to empty,
> I
> refilled with Premium gas. This week, when THAT tank was almost empty,
> I
> again refilled with Premium gas. So far, I haven't noticed any
> improvement
> in performance, i.e. it ran great before, it still runs great.
>
> QUESTION: How many consecutive tankfuls of a different grade of gas
> does it
> take before the computer in the 99 Camry "retrains" to the different
> octane
> level?

The ECU does not recognize the octane number, instead, it listens to
"knock" (detonation) and varies the timing and fuel accordingly. Octane
is detonation retardant. Higher octane prevent detonation. But higher
octane will cause engine difficult to start, especiall in cold weather.
Basic rule is to put the smallest number of octane that you will not
notice any difference or hear pinging (noise of detonation)
Unless you have a high performance engine, turbocharged or supercharged
engine that is tuned for higher octane gas, you will not notice any
different between regular or premium gas. I have both 3sgte and 1MZFE
and I only put regular in the Solara.


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Old 27 Aug 2005, 10:44 am   #4 (permalink)
Mark A
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Default Re: Effect of premium gas

"Sharx35" <sharx35@hotmail.com> wrote in message
news:1XUPe.157430$wr.128678@clgrps12...
> Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
> unleaded gas, per the manual. The manual mentions how I could get
> "improved performance" using Premium gas. I stand to be corrected but,
> here in Canada, I believe the usual 3 grades of gas available are rated
> 87, 89 and 91 on some kind of octane scale. Last week, when the tank was
> close to empty, I refilled with Premium gas. This week, when THAT tank was
> almost empty, I again refilled with Premium gas. So far, I haven't noticed
> any improvement in performance, i.e. it ran great before, it still runs
> great.
>
> QUESTION: How many consecutive tankfuls of a different grade of gas does
> it take before the computer in the 99 Camry "retrains" to the different
> octane level?

You will get a horsepower increase with a higher octane fuel, and also
better gas mileage. However, the improvements in both of these might not be
very noticeable. Both improvements would be more noticeable if you are
driving your car for longer distances (and engine was fully heated up) and
the ambient temperature is fairly high 90F +. Since you are in Canada, you
might try midgrade in summer and regular in winter.


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Old 27 Aug 2005, 08:18 pm   #5 (permalink)
HachiRoku
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Default Re: Effect of premium gas

On Sat, 27 Aug 2005 07:50:21 +0000, Sharx35 wrote:

> Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
> unleaded gas, per the manual. The manual mentions how I could get "improved
> performance" using Premium gas. I stand to be corrected but, here in Canada,
> I believe the usual 3 grades of gas available are rated 87, 89 and 91 on
> some kind of octane scale. Last week, when the tank was close to empty, I
> refilled with Premium gas. This week, when THAT tank was almost empty, I
> again refilled with Premium gas. So far, I haven't noticed any improvement
> in performance, i.e. it ran great before, it still runs great.
>
> QUESTION: How many consecutive tankfuls of a different grade of gas does it
> take before the computer in the 99 Camry "retrains" to the different octane
> level?


I get about a 15% increase in MPG with premium in ALL my Toyotas, and none
of them knock, either...

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to know the difference
between chicken shit
and chicken salad...

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Old 27 Aug 2005, 11:57 pm   #6 (permalink)
Peter
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Default Re: Effect of premium gas

Hi,

got a 96 V6 Australian Bulit Camry, always use Shell Optimax (about 98 I
think).

Takes about 2 tanks to clean it out and run on the high octane. I notice a
small improvement in power (noticeable but not wheel spinning etc), engine
runs smoother and better mpg.

Was dubious on the mpg side but I visit my relatives in Nowra a bit and
alwas wondered why my fuel economy on the return trip (600 miles) was always
worse than the trip there. Much the same conditions there and back (in terms
of slope etc).

Figured out, eventually, that the Service Station in Nowra sold Premium
Unleaded and not Shell Optimax. Found one that had Optimax and the fuel
economy came back. Got about an extra 50 miles out of the tank. But thats on
a long straight, relatively flat run with dual highway.

Get about 30mpg around town but there's a bit of freeway in that as well and
usually keep the revs under 3000.

rgds

Peter




"Sharx35" <sharx35@hotmail.com> wrote in message
news:1XUPe.157430$wr.128678@clgrps12...
> Since purchasing my 99 Camry SIX cylinder in 1999, I have used regular
> unleaded gas, per the manual. The manual mentions how I could get

"improved
> performance" using Premium gas. I stand to be corrected but, here in

Canada,
> I believe the usual 3 grades of gas available are rated 87, 89 and 91 on
> some kind of octane scale. Last week, when the tank was close to empty, I
> refilled with Premium gas. This week, when THAT tank was almost empty, I
> again refilled with Premium gas. So far, I haven't noticed any improvement
> in performance, i.e. it ran great before, it still runs great.
>
> QUESTION: How many consecutive tankfuls of a different grade of gas does

it
> take before the computer in the 99 Camry "retrains" to the different

octane
> level?
>
>



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