Old 12-02-05, 03:21 PM
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I have a 2002 Lexus ES300. Drivers manual saids to use high octane gas
but also saids regular gas maybe used occasionally when high octane
isn't available. I have used lower octane gas and feel no difference in
preformance or hear any knocking. I understand the timing is adjusted
by a computer when lower octane is used to eliminate knocking. I know
regular gas burns a little hotter so the oil would need more frequent
changing. Is there a reason I shouldn't use lower octane gas all the
time? Some one told me the 2002 Camary has the same engine but regular
gas is recommended. Why is this?
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Old 12-02-05, 03:54 PM
Join Date: Jun 2002
Location: Long Island, NY
Posts: 1,531
From the 2002 Camry owner's manuel:

1MZ–FE engine
Unleaded gasoline, Octane Rating 87
(Research Octane Number 91) or
higher. For improved vehicle performance,
the use of premium unleaded
gasoline with an Octane Rating of 91
(Research Octane Number 96) or
higher is recommended.

Use a couple of tank fulls of each and record the mileage and performance and see for your self which is better
Old 12-03-05, 11:04 AM
Join Date: Oct 2000
Location: Livonia, Michigan
Posts: 923
Car and Driver did such a study and found that any money you saved using regular fuel was lost in reduced gas mileage. Moreso nowadays since the expense for premium is still 20 cents, making it only 10% more expensive than the 20% it was a few years back.
Old 12-16-05, 06:47 PM
LouBazooka's Avatar
Join Date: Dec 2005
Posts: 553
I only use premium fuel and I always get very good gas mileage as well as power when i need it, especially in the summer months when you need to run the a/c and still have power available when u hit the gas
Old 12-17-05, 04:08 PM
Praxius's Avatar
Join Date: Feb 2004
Location: Central CT
Posts: 121
The question still remains, Is there any reason (engine damage, corrosion, etc...) why one should not use regular when a higher octane is recomended?

I am curious too.

Old 12-17-05, 05:38 PM
Join Date: Oct 2000
Location: Livonia, Michigan
Posts: 923
The above answers are valid for cars that have knock sensors -- meaning the car's computer adjusts for timing regardless of the octane used via input from the sensors.

If your car does not have knock sensors AND specifies an octane higher than 87, there's a good chance the engine will experience knocking with 87 octane. Over time this knocking will damage the engine, sometimes blowing a hole in a piston.

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