View Poll Results: What Octane do you put in your '98 - '05 GS4?
86 or below (available in Ohio, Michigan, Indiana, West Virginia, Kentucky, etc.)
0
0%
87
6
4.41%
89
8
5.88%
91 (does 91 exist? I'm not 100% certain.....)
45
33.09%
93
71
52.21%
94 (Sunoco)
3
2.21%
95 or above
3
2.21%
Voters: 136. You may not vote on this poll
What Octane do you use for your 1998 - 2005 GS400?
09-22-04 | 06:15 AM
#16
Here is the quote from 2000 GS Owner's Manual that explains what fuel type should be used and what "premium" means.
"Octane rating
Select premium unleaded gasoline with an Octane
Rating of 91 (Research Octane Number 96) or higher
for optimum engine performance. However, if such
premium type cannot be obtained, you may
temporarily use unleaded gasoline with an Octane
Rating as low as 87 (Research Octane Number 91)."
"Octane rating
Select premium unleaded gasoline with an Octane
Rating of 91 (Research Octane Number 96) or higher
for optimum engine performance. However, if such
premium type cannot be obtained, you may
temporarily use unleaded gasoline with an Octane
Rating as low as 87 (Research Octane Number 91)."
09-22-04 | 12:07 PM
#17
Originally posted by mikal
91 is Premium for us. It use to be 92 but for some reason they brought it down to 91 about 4-5 Years ago.
This is how it goes.
87 - Regular
89 - Plus
91 - Premium
I guess it's because of the Strict Emissions we have here in California
91 is Premium for us. It use to be 92 but for some reason they brought it down to 91 about 4-5 Years ago.
This is how it goes.
87 - Regular
89 - Plus
91 - Premium
I guess it's because of the Strict Emissions we have here in California
(sorry - couldn't resist)
09-22-04 | 09:43 PM
#19
Lexus Connoisseur
Joined: Mar 2001
Posts: 19,802
Likes: 534
From: USA
Originally posted by engin_ear
86 - Weasel ****
86 - Weasel ****
09-23-04 | 04:43 AM
#20
Do you think you get better mileage becuase the timing is being retarded and the mix is leaner than normal?
But either way it realy isnt about clean burning is it, its really about the ability to resist detonation in our relativley high compression engines.
But either way it realy isnt about clean burning is it, its really about the ability to resist detonation in our relativley high compression engines.
09-23-04 | 09:39 AM
#22
Re: Re: What Octane do you use for your 1998 - 2005 GS4?
Originally posted by morris
Dude do not switch to the 89, the manual actually says you can use it temporarily but it is not recomended because it will cause detonation. The car will retard timing to prevent the detonation but the net result is a loss of performance and power.
Dude do not switch to the 89, the manual actually says you can use it temporarily but it is not recomended because it will cause detonation. The car will retard timing to prevent the detonation but the net result is a loss of performance and power.
09-24-04 | 12:49 PM
#25
Driver School Candidate
Joined: Aug 2004
Posts: 32
Likes: 0
From: Georgia
In Georgia the highest I have found is 93...so that's what I ride to. When I first got it I put the low octane in (can't remember if it was 87 or 89) and it seemed to run a bit sluggish...maybe it was my imagination. The next fill up I went with 93 and haven't looked back since...
09-30-04 | 02:23 PM
#30
Advanced
Joined: Dec 2001
Posts: 696
Likes: 6
From: Texas
Originally posted by flipside909
You laugh, but 86 octane is available in higher elevations (leaner conditions). 86 actually runs cleaner and than higher octane fuels. I actually have gotten the best mileage with 86 octane fuel (not on a 1UZ or 3UZ) with 1MZ-FE V6 powered vehicles in the Southwest states- AZ,NM,TX.
You laugh, but 86 octane is available in higher elevations (leaner conditions). 86 actually runs cleaner and than higher octane fuels. I actually have gotten the best mileage with 86 octane fuel (not on a 1UZ or 3UZ) with 1MZ-FE V6 powered vehicles in the Southwest states- AZ,NM,TX.