View Poll Results: What kind of gas are you using these days?
Premium
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93
51.96%
Regular
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86
48.04%
Voters: 179. You may not vote on this poll
What kind of gas? Premium or regular? (merged GX gas threads)
#226
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I'm voting only a coincidence. Makes no sense at all. If you told be he put diesel in, I'd buy that.
#227
#228
Lexus Test Driver
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#230
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Trying to understand the purpose to the occasional use of higher octane ? Is there a benefit to the use of it other than increased performance while using that tank of gas? Other than the higher octane, is there something else in there that I am missing?
#231
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The GX owner's manual says the following, Lexus requires that you use an octane rating of 87 and above in your GX. For improved performance they "recommend" premium. To that end a higher octane gas will do nothing to keep your engine cleaner. Using only quality gas that adds quality detergents e.g. Chevron w/Techron is more important IMO then the octane count. Chevron not only adds their proprietary detergent, Techron to their gas, but they add it at levels above the minimum required by the EPA, whereas most gasoline/oil companies add only the minium. Add a bottle of Techron every 4 to 6 months as a preventative measure to keep injectors clean.
Last edited by cssnms; 04-09-11 at 08:11 AM.
#232
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The octane requirement per the owner's manual is 87 and above, while premium is recommended for improved performance. 89 is a compromise and a waste of $ IMO as the performance gain over 87 is negligible.
Last edited by cssnms; 04-09-11 at 06:08 AM.
#233
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No. It has nothing to do with the gas. Modern combustion engines that "require" premium can run on 87 octane. It's not the best thing for the engine long term, and performance will be greatly compromised, but it will run.
Last edited by cssnms; 04-09-11 at 06:09 AM.
#234
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I don't own a GX but on my IS I use premium. I did have to put regular in it once when I was out in BFE and the tank was pretty much totally empty, oddly enough it started but didn't idle normally. Have never used anything lower than 91 since that time. The other reason why I would only use 91 is that in my area anything lower usually is a combination of ethanol and gasoline.
#235
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I don't own a GX but on my IS I use premium. I did have to put regular in it once when I was out in BFE and the tank was pretty much totally empty, oddly enough it started but didn't idle normally. Have never used anything lower than 91 since that time. The other reason why I would only use 91 is that in my area anything lower usually is a combination of ethanol and gasoline.
Ethanol is in ALL grades of gas in my area at 98% of the stations - it kills mpg's. Non ethanol gas will become increasingly more difficult to find and if our beloved bureaucrats have anything to do with it, it will eventually fade away all together.
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Last edited by cssnms; 04-10-11 at 09:14 AM.
#236
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Cut and paste straight from 06 GX user manual:
"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)."
Cut and paste straight from 07 GX user manual (same as 08 and 09):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
"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)."
Cut and paste straight from 07 GX user manual (same as 08 and 09):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
Last edited by ChrisK; 04-09-11 at 11:42 AM.
#237
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Cut and paste straight from 96 GX user manual:
"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)."
Cut and paste straight from 97 GX user manual (same as 98 and 99):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
"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)."
Cut and paste straight from 97 GX user manual (same as 98 and 99):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
Cut and past straight from my my 2005 GX Owner's manual....
"Select Octane Rating 87 (Research Octane Rating 91) or higher. For improved vehicle performance, the use of premium gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher is recommended."
There are no engine differences between your GX w/the VVTI engine and my GX w/the VVTI engine. IT is perplexing why Toyota says it's okay to use 87 octane in my GX, but not yours? In addition, Toyota does not recommmend premium gas in the 4 runner V8 which has the exact same engine.
The pump gas octane rating of 87 is the mean of RON and MON, which equates to avg RON rating of 91 octane.
In 5 yrs no problems and no knocking. I will keep using Regular.
#238
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Cut and paste straight from 96 GX user manual:
"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)."
Cut and paste straight from 97 GX user manual (same as 98 and 99):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
"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)."
Cut and paste straight from 97 GX user manual (same as 98 and 99):
"Fuel types
Use premium unleaded gasoline. (91 Octane Rating [Research Octane Number
96] or higher)"
#239
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I looked all of them up because they are available from Lexus. It was pointed out how user manual says 87. That is not necessarily true without providing the specific year.
Last edited by ChrisK; 04-09-11 at 12:56 PM.
#240