View Poll Results: Which Gas do you use?
Regular
157
49.53%
Plus
51
16.09%
Premium
109
34.38%
Voters: 317. You may not vote on this poll
Poll: Which Gas
#31
Super Moderator
Pemex 92 Octane here in Mexico, though the stuff is pure garbage, but with a monopoly you do not have much choice. A lot of my buddies just buy their gas, Sunoco, at the track and drive around on that, though 109 octane.
#32
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I remember reading that a Sienna owner put in 91-octane fuel and the hesitation disappeared.
Could this be it?
Also, I heard that there's a new TSB out for all 3.3L. Anybody hear about it?
Could this be it?
Also, I heard that there's a new TSB out for all 3.3L. Anybody hear about it?
#33
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What is the TSB about? (3.3L)
Originally Posted by CarsFreak
I heard that there's a new TSB out for all 3.3L. Anybody hear about it?
What is the TSB about (what does it cover)?
#34
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Anyting more than 87 is wasted money
The term "premium" is misleading. There is no (as in zero) more energy in premium than in 87. It does not burn hotter and it does not burn cleaner. Higher octane gas has more of a chemical that retards gas from igniting, and that’s it.
That was important in cars before computers, because high performance engines were susceptible to premature ignition, i.e., engine knock. That knock meant a piston was igniting early, before it reached the peak of its cycle, and was actually working against the other pistons. That was very damaging to the car.
Modern cars have computers that detect engine knock and adjust the timing to stop it. An engine designed to run on premium will not perform quite as well on 87 because the computer timing adjustment will also impact horsepower and torque. I’m not sure whether the computer timing will increase performance of an engine designed to run on regular. My guess is slight, but I doubt it would be detectible.
So, basically you have been wasting your money on gas higher than 87. I use 87 in our 330 and premium in my 350Z.
I’m not an expert. When I first bought my 350Z I Googled the subject and found some excellent sites that explain it well. Here are some of them.
http://www.rxp.com/Octane.htm
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
http://www.omegamotors.com/enjoy/gas...soline_06.html
http://mywebpages.comcast.net/rx300how2/
http://theserviceadvisor.com/octane.htm
Once you read them, please let me know whether I got it wrong.
That was important in cars before computers, because high performance engines were susceptible to premature ignition, i.e., engine knock. That knock meant a piston was igniting early, before it reached the peak of its cycle, and was actually working against the other pistons. That was very damaging to the car.
Modern cars have computers that detect engine knock and adjust the timing to stop it. An engine designed to run on premium will not perform quite as well on 87 because the computer timing adjustment will also impact horsepower and torque. I’m not sure whether the computer timing will increase performance of an engine designed to run on regular. My guess is slight, but I doubt it would be detectible.
So, basically you have been wasting your money on gas higher than 87. I use 87 in our 330 and premium in my 350Z.
I’m not an expert. When I first bought my 350Z I Googled the subject and found some excellent sites that explain it well. Here are some of them.
http://www.rxp.com/Octane.htm
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
http://www.omegamotors.com/enjoy/gas...soline_06.html
http://mywebpages.comcast.net/rx300how2/
http://theserviceadvisor.com/octane.htm
Once you read them, please let me know whether I got it wrong.
#35
I dont know if it is just for RX or not (the poll) but my LS430 '01 RQ@UIRES ultra
It sucks because i pay like 2.30$ for a gallon.
23 gallon tank
You do the math
Mink92890
It sucks because i pay like 2.30$ for a gallon.
23 gallon tank
You do the math
Mink92890
#36
Lexus Test Driver
Join Date: Mar 2004
Location: Wisconsin
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Mpg
You really didn't buy a LS 430 & think about mileage did you? If one can afford vehicles like these, mileage should not even be on our mines.
There are other vehicles out there that get better MPG but we did not buy them.
There are other vehicles out there that get better MPG but we did not buy them.
#37
Lexus Test Driver
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Everybody on this thread so far has been very helpful with the gas pole but i believe that without hard facts on regular, plus or premium i'll still believe that premium burns cleaner, and less harmful to any gasoline engine, plus i don't mine paying $2.20 for premium where i'm at.
#38
Even though regular is cheaper, I find that the car runs a hella lot smoother with premium. For some reason the RX my friend bought has an acceleration lag to it when she fills it with regular.
#39
Listen to your car...
Is it running smoothly? Do you hear knocking?
Does changing the gas make any driveability difference?
I try to take the best care of my vehicles and my RX300 runs fine with 87.
Take that same 87 on my other vehcle, and ES300 (essentially SAME 1MZ-FE engine, and it's not as smooth, slight knock (especially noticable going slowly uphill, under load). When I switched to 93, that went away.
Does changing the gas make any driveability difference?
I try to take the best care of my vehicles and my RX300 runs fine with 87.
Take that same 87 on my other vehcle, and ES300 (essentially SAME 1MZ-FE engine, and it's not as smooth, slight knock (especially noticable going slowly uphill, under load). When I switched to 93, that went away.
#40
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Have tried Premium but couldn't find any difference other than the cost. I use Regular and haven't noticed any problems even in the Mountains (hills) of Vermont or Tennessee.
#42
Originally Posted by Kyosuke86
Even though regular is cheaper, I find that the car runs a hella lot smoother with premium. For some reason the RX my friend bought has an acceleration lag to it when she fills it with regular.
The only possible explanation is when tranny shift to a higher gear, RXs that burn premium output lower power than those burn regular so you don't feel as big of a jolt between gears.
Higher octance means higher resistance to explosion. If you put higher octane to engines designed for 87 such as 1MZFE, you get unburned mixtures and lower power. Pay higher price, get lower performance, plus clogging up your catalytic converter with unburned carbon deposit, be careful here.
Last edited by TunedRX300; 06-14-05 at 10:23 AM.
#44
Originally Posted by parula
Yea and we are saving money at these prices - glad I don't have a Beemer - don't they require premium?
#45
Originally Posted by Lexy GS430
Everybody on this thread so far has been very helpful with the gas pole but i believe that without hard facts on regular, plus or premium i'll still believe that premium burns cleaner, and less harmful to any gasoline engine, plus i don't mine paying $2.20 for premium where i'm at.