Go Back   Club Lexus Forums > Lexus Model Forums > LS Models > LS400
Sign in using an external account
Register Forgot Password?

What octane gas do you use? (The Mother thread)

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 01-12-12, 01:53 PM   #151
McPierson
Pole Position
Trader Score: (2)
 
Join Date: Jun 2011
Location: Missouri
Posts: 243
Default

It's probably fine to run regular if you never run your car past 1/2 throttle. If the cars volumetric effeciency isn't very high there will be less cylinder pressure before ignition. Pressure and temperature are what cause detonation.

I still think it's a bad move, and would never recommend it.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
McPierson is offline   Reply With Quote
Old 01-12-12, 04:09 PM   #152
PureDrifter
BahHumBug
Trader Score: (10)
 
PureDrifter's Avatar
 
Join Date: Aug 2004
Location: California
Posts: 22,789
PureDrifter
Send a message via AIM to PureDrifter
Default

Quote:
Originally Posted by bwils View Post
I was using premium 93 at first, then my gas station got some 87 but with no ethanol. I started using it and I get way better mileage. Imo find some non ethanol gas and try it. Ull see an improvement mpg for sure
given the rate at which our govt. is subsidizing ethanol and promoting it's use in gas as a replacement for MTBE that's going to just get harder.
__________________
1. Black on Black 1999 LS400 PM-spec
-Maya-Megan-Magnaflow-LSportline-Xenondepot-PPE Engineering-Duce-Platinum VIP-Figs Engineering-R1Concepts-
2. Black 2001 MR2 Spyder -#muchroadster-
3. Black 2004 IS300 -Manaray-HKS-Eibach-Kumho-
4. Ebony Teal 1995 LS400 11-8-06
PureDrifter is offline   Reply With Quote
Old 01-13-12, 10:40 AM   #153
VJZ
Lead Lap
Trader Score: (3)
 
VJZ's Avatar
 
Join Date: Sep 2007
Location: Nappanee, Indiana
Posts: 727
Default

I will never understand why people use less than 93. If that extra few dollars is going to break your bank...DON'T buy a car that runs on premium fuel!
__________________
1976 Toyota Celica GT//2003 Lexus IS300 Sportcross //1985 Mazda RX-7//2012 Ford Escape Limited 4x4
VJZ is offline   Reply With Quote
Old 01-13-12, 11:10 AM   #154
McPierson
Pole Position
Trader Score: (2)
 
Join Date: Jun 2011
Location: Missouri
Posts: 243
Default

I think that 91 is "premium". We can't get 93 here, but I think that's "super".
McPierson is offline   Reply With Quote
Old 01-13-12, 03:34 PM   #155
PureDrifter
BahHumBug
Trader Score: (10)
 
PureDrifter's Avatar
 
Join Date: Aug 2004
Location: California
Posts: 22,789
PureDrifter
Send a message via AIM to PureDrifter
Default

here in cali i'll take the most premium i can get.... lol

japan gets like 101/103octane premium, makes tuning turbo/sc cars out there so much easier...
__________________
1. Black on Black 1999 LS400 PM-spec
-Maya-Megan-Magnaflow-LSportline-Xenondepot-PPE Engineering-Duce-Platinum VIP-Figs Engineering-R1Concepts-
2. Black 2001 MR2 Spyder -#muchroadster-
3. Black 2004 IS300 -Manaray-HKS-Eibach-Kumho-
4. Ebony Teal 1995 LS400 11-8-06
PureDrifter is offline   Reply With Quote
Old 01-13-12, 05:18 PM   #156
denverdog
Pole Position
Trader Score: (0)
 
Join Date: Dec 2004
Posts: 242
Default

here is a link to a good article explaining octane. a hydrocarbon unit is a carbon atom with one hydrogen atom to the top, and one to the bottom. the chains they refer to are hydrocarbon units connected side to side. if eight of them (the carbon atoms) are coinnected side to side that is an octane. the energy released does not depend on whether you are exploding octanes, heptanes, or any other "tanes. all gasoline has several different 'tanes in it. its just that the higher the octane, the more of the longer chains it has. this reduces volatility and means you can compress it more (which raises the temperature) before it self-detonates without a spark. it is the explosion in a smaller space that leads to greater power being supplied to the drivetrain, not the inherent qualities of the gasoline.

http://auto.howstuffworks.com/fuel-e...uestion901.htm

there was also a show on this that might have been in the "modern marvels" series, but i'm not sure of that.

at higher altitudes, the thin air effectively raises your octane rating by 2-3 points. i'm in denver. i burn regular (listed as 85 octane) and never have knocking even when driving up through the mountains up to 143,000 feet. both before and after the switch to regular i got right around 19.5 mpg overall. i live in the burbs and don't do a lot of true "city" stop and go driving.
denverdog is offline   Reply With Quote
Old 02-13-12, 12:30 PM   #157
timmy0tool
Lexus Champion
Trader Score: (5)
 
timmy0tool's Avatar
 
Join Date: Sep 2008
Location: 909/626/714, SoCal
Posts: 2,657
Send a message via AIM to timmy0tool
Default

Quote:
Originally Posted by PureDrifter View Post
here in cali i'll take the most premium i can get.... lol

japan gets like 101/103octane premium, makes tuning turbo/sc cars out there so much easier...
certain 76 stations here in socal have 100 oct but at around $8/gal that's expensive.

91 oct for me all day, shell/chevron/76 only. we can debate about the quality of gas in another thread.
__________________
lateral Gangsta
timmy0tool is offline   Reply With Quote
Old 02-13-12, 12:42 PM   #158
sethjon
Driver
Trader Score: (0)
 
Join Date: Jan 2011
Location: ca
Posts: 157
Default

Quote:
Originally Posted by thermal View Post
The recommended is premium unleaded, but with the price of gas going up, do any of you 'cheat' and use regular?

Will it harm the engine to use lower-octane gas?
I use 89 all the time and it runs great. I should try the 87 but haven't yet. If you don't get preignition and see no loss of power you will be fine. Try 5 gallons the first time.
sethjon is offline   Reply With Quote
Old 02-13-12, 12:47 PM   #159
denverdog
Pole Position
Trader Score: (0)
 
Join Date: Dec 2004
Posts: 242
Default

before i get any wisecracks, let me set the record straight. i haven't driven up to 143,000 feet. only 14,300 feet.
denverdog is offline   Reply With Quote
Old 02-13-12, 05:28 PM   #160
Rdrcr
Rookie
Trader Score: (0)
 
Join Date: Jun 2011
Location: CA
Posts: 76
Default

Quote:
Originally Posted by timmy0tool View Post
certain 76 stations here in socal have 100 oct but at around $8/gal that's expensive.

91 oct for me all day, shell/chevron/76 only. we can debate about the quality of gas in another thread.
I live real close to one of the 100 Octane 76 gas stations. It is crazy expensive but, having 100 octane close by has helped me out in the past with a couple of my vehicles. Now, I simply use water injection to cure my need for expensive high octane fuel.

In my LS, I use 91 octane.

Mike
Rdrcr is offline   Reply With Quote
Old 02-13-12, 05:53 PM   #161
awdandrwd
Driver
Trader Score: (1)
 
awdandrwd's Avatar
 
Join Date: Oct 2010
Location: CA
Posts: 110
Default

Quote:
Originally Posted by bwils View Post
I was using premium 93 at first, then my gas station got some 87 but with no ethanol. I started using it and I get way better mileage. Imo find some non ethanol gas and try it. Ull see an improvement mpg for sure
Using gas with ethanol in it should yield lower mileage since ethanol is "lighter" and you need to flow/burn more of it to get the same amount of energy as regular gasoline. It will also not do anything for octane rating, 87 with ethanol is still 87 octane. Gas cap says "premium only", 87 isn't so YMMV (I wouldn't even try it personally).

I use the best fuel I can which around here is 91 octane from Chevron. All of our fuel has 10% ethanol in it.

Stan
awdandrwd is offline   Reply With Quote
Old 02-13-12, 06:08 PM   #162
Lavrishevo
Lexus Champion
Trader Score: (1)
 
Lavrishevo's Avatar
 
Join Date: Jan 2012
Location: Atlanta, GA
Posts: 2,416
Default

91 or 93 as well.
Lavrishevo is offline   Reply With Quote
Old 02-13-12, 08:21 PM   #163
MyRolla
Driver School Candidate
Trader Score: (0)
 
Join Date: Feb 2012
Posts: 40
Default

If the car's manual says premium i give the car premium, every other car gets 87 lucky in NY we have 93, if a car is stock there's no reason to use more than what's needed, it's funny when guys throw 93 octane in a civic and expect to hit anything faster than the usual 18's in a qtr
MyRolla is offline   Reply With Quote
Old 02-13-12, 08:31 PM   #164
awdandrwd
Driver
Trader Score: (1)
 
awdandrwd's Avatar
 
Join Date: Oct 2010
Location: CA
Posts: 110
Default

Using higher octane than tuned for is common for track days, engine should run cooler. Those Civics do have very high compression ratio, as do our cars.

Stan
awdandrwd is offline   Reply With Quote
Old 02-13-12, 08:57 PM   #165
PureDrifter
BahHumBug
Trader Score: (10)
 
PureDrifter's Avatar
 
Join Date: Aug 2004
Location: California
Posts: 22,789
PureDrifter
Send a message via AIM to PureDrifter
Default

common where? if your car is tuned for '87, running 91 is a sheer waste of money.

even people at track days don't wanna waste money
__________________
1. Black on Black 1999 LS400 PM-spec
-Maya-Megan-Magnaflow-LSportline-Xenondepot-PPE Engineering-Duce-Platinum VIP-Figs Engineering-R1Concepts-
2. Black 2001 MR2 Spyder -#muchroadster-
3. Black 2004 IS300 -Manaray-HKS-Eibach-Kumho-
4. Ebony Teal 1995 LS400 11-8-06
PureDrifter is offline   Reply With Quote
Old 02-13-12, 08:57 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
switching from 87 octane to 89 octane gas (IS250) JP250 IS - Second Generation 62 06-13-12 04:50 PM
What octane gas do you put in your es?? duly ES300 and ES330 29 02-12-12 06:31 PM
Am I damaging my GS430 by using 91-octane premium gas in California? (93-oct at home) ToyotaLexus GS - Second Generation 20 09-26-05 09:22 PM
highest octane gas? kylesc400 Maintenance 14 02-24-03 08:21 AM
Is Premium Gas Necessary? MPLex Maintenance 10 04-30-01 05:19 AM


Tags
1991, 1995, 1998, 400, 57, 87, 91, 93, 94, 95, 97, acura, affective, car, clublexus, differences, es300, es330, fuel, gas, gasoline, idiot, isf, kind, king, legend, lexus, lincoln, low, lower, ls, ls400, ls400s, octaine, octane, oil, ok, premium, pump, put, putting, quarter, regular, run, tank, toyota, type, unleaded, week

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 03:03 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info