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Gasoline, 87 vs 89 octane fuel

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Peter912 View Member Profile	May 18 2007, 04:14 PM Post #1
Member Group: Members Posts: 38 Joined: 4-July 06 Member No.: 19,501 Status: Location: Canada Drives: 2006 Hyundai Elantra VE 2.0	Any advantage or disadvantage of using 89 octane as opposed to 87 octane fuel for the 2006 Elantra ? This is a little off topic and I am not even sure if I am allowed to post the following message or not.I wanted to post a message at elantraxd.com and I got a warning from McAfee Site Advisor that that site may cause a breach of browser security "In their tests this site attempted to make unauthorized changes to our test PC by exploiting a browser security vulnerability which could infect your PC" What do the rest of you think of this ? I used to visit that forum because it is a bit more technical than this one is. This post has been edited by Peter912: May 18 2007, 04:15 PM

Doohickie View Member Profile	May 18 2007, 11:46 PM Post #2
Expert Group: Members Posts: 567 Joined: 24-June 05 Member No.: 8,496 Status: Location: Ft Worth, TX Drives: 2005 Elantra GLS 5-door	I think your security settings are set a little high. It probably just wanted to store a cookie or something. As for octane, unless you have a driveability problem like pinging, I don't think the higher octane does any good. My understanding is that any performance increase will be nullified by the ECU which will adjust it out.

Peter912 View Member Profile	May 19 2007, 06:39 PM Post #3
Member Group: Members Posts: 38 Joined: 4-July 06 Member No.: 19,501 Status: Location: Canada Drives: 2006 Hyundai Elantra VE 2.0	QUOTE(Doohickie @ May 18 2007, 11:46 PM) I think your security settings are set a little high. It probably just wanted to store a cookie or something. As for octane, unless you have a driveability problem like pinging, I don't think the higher octane does any good. My understanding is that any performance increase will be nullified by the ECU which will adjust it out. [right][snapback]88569[/snapback][/right] I don't think it had anything to do with my security settings because the message was that they attempted to make "an unauthorized change" to THEIR (McAfee) test computer,not mine. I have never received a message like this before on any other site I have visited and yes I was surprised.If I knew their e mail address at elantraxd.com I could perhaps ask the forum administrator if they could explain this .So Doohickie your virus protection isn't giving out any warning about this site ( elantraxd.com ) like McAfee is ? Regarding the octane, what if the octane is a little lower than the stated 87,so buying 89 is sort of like an insurance against that happening.What exactly is "ECU" ,some sort of emission control ? So other than the extra cost there wouldn't be any harm in using the higher octane fuel but there wouldn't be any benefit either ?

Doohickie View Member Profile	May 19 2007, 07:14 PM Post #4
Expert Group: Members Posts: 567 Joined: 24-June 05 Member No.: 8,496 Status: Location: Ft Worth, TX Drives: 2005 Elantra GLS 5-door	The ECU is the Engine Control Unit; that's a fairly generic term for cars and I think on the Elantra it's actually called the Powertrain Control Module (PCM). My understanding is that it wouldn't hurt to use higher octane, but there isn't any appreciable performance difference either. I visit EXD regularly, I have McAfee on my computer, and I've never gotten any security messages. But who knows?

Peter912 View Member Profile	May 20 2007, 03:46 PM Post #5
Member Group: Members Posts: 38 Joined: 4-July 06 Member No.: 19,501 Status: Location: Canada Drives: 2006 Hyundai Elantra VE 2.0	QUOTE(Doohickie @ May 19 2007, 07:14 PM) The ECU is the Engine Control Unit; that's a fairly generic term for cars and I think on the Elantra it's actually called the Powertrain Control Module (PCM). My understanding is that it wouldn't hurt to use higher octane, but there isn't any appreciable performance difference either. I visit EXD regularly, I have McAfee on my computer, and I've never gotten any security messages. But who knows? [right][snapback]88664[/snapback][/right] Doohickie,do you have the latest McAfee update (it's free) ? It contains a feature called "McAfee SiteAdvisor" When I try to go to the EXD website I am redirected by McAfee to warn me that "this site tries to change one's browser" Could you do me a favour and tell the forum administrator at EXD about this and see what he has to say about this ? Then maybe you could let me know what they said about this. Thanks, Peter p.s. If you rather I told them could you find out their e mail address ,so I could write and explain this.McAfee says that it is a "security threat " to go to that site and that going there could "infect one's computer".

Lefteris View Member Profile	Jun 17 2007, 09:21 AM Post #6
Newbie Group: Members Posts: 18 Joined: 1-April 07 Member No.: 29,269 Status: Location: Greece Drives: Hyundai Lantra J2 GLS 1.6L 1996	well sorry to say that,but i'm really diasappointed about the quality of fuel in Canada and USA.so poor fuel can damage the engine, reduce the responsiveness in accelerating and generally the perfomance of the car, leave the compustion chamber really black! Last but not least, the exhaust-gases are far more than they should be and of course they pollute the environment even more! In Greece (and probably in the whole European Union) you cannot find fuel with lower than 95 oct, plus the last 5 years there's a new one available with 100oct! i also think that oil comes from the same brands as in America: BP,Shell,Mobil etc. shouldn't this worry you a little bit? it happens to know that american automakers also complain about it This post has been edited by Lefteris: Jun 17 2007, 09:22 AM

Doohickie View Member Profile	Jun 17 2007, 03:18 PM Post #7
Expert Group: Members Posts: 567 Joined: 24-June 05 Member No.: 8,496 Status: Location: Ft Worth, TX Drives: 2005 Elantra GLS 5-door	The octane ratings and other properties of gasoline are as prescribed by the government. It's one of those "it's always been that way" kinds of things, and changing it would mean taking on the big oil companies. With a president who's an oil man himself, what do you think the odds of that happening are? The last major change in gasoline in the U.S. was back in the 1970s when lead was removed. This post has been edited by Doohickie: Jun 17 2007, 03:18 PM

SoUnexpected View Member Profile	Jul 11 2007, 09:06 PM Post #8
Newbie Group: Members Posts: 2 Joined: 18-June 07 Member No.: 31,801 Status: Location: Seattle, WA Drives: 2006 Hyundai Elantra	I have a short ram air intake, I use to use 87. Then I started using higher octane like 89 or 92... When I use a higher octance I feel my car performs better of the line and has better acceleration. Furthermore my car is an 06' 5-speed Elantra, hope this helps.

aaronwt View Member Profile	Jul 29 2007, 10:43 PM Post #9
Newbie Group: Members Posts: 6 Joined: 4-July 07 Member No.: 32,383 Status: Location: Northern VA(Woodbridge)USA Drives: 2007 Elantra GLS	QUOTE(SoUnexpected @ Jul 11 2007, 09:06 PM) I have a short ram air intake, I use to use 87. Then I started using higher octane like 89 or 92... When I use a higher octance I feel my car performs better of the line and has better acceleration. Furthermore my car is an 06' 5-speed Elantra, hope this helps. [right][snapback]97040[/snapback][/right] Any better mileage? I just did my second fillup. I got almost 31 mpg on my first tankful with 70% highway driving. My second tank got me just under 27 mpg. Both tanks had around 70% highway driving with the AC on 100% of the time. The only difference I see would be the gas. I used Exxon gas when I filled up. I don't know what the dealer used but I need to find out. I get better mileage from my 9 year old Cavalier with the AC running 100% of the time. Hopefully it's just the engine breaking in. I certainly hope this third tank isn't the same. It's Exxon gas also. If it is I guess I'll try 89 octane to see if that makes a difference.

mimms View Member Profile	Aug 9 2008, 05:16 AM Post #10
Newbie Group: Members Posts: 2 Joined: 2-August 07 Member No.: 33,443 Status: Location: usa Drives: 05 elantra	If you read the owner's manual it will tell you that the engine in the Elantra(at least my 05) is meant to use premium. I experimented and found that i get better performance and better mileage from premium

Doohickie View Member Profile	Aug 11 2008, 10:02 PM Post #11
Expert Group: Members Posts: 567 Joined: 24-June 05 Member No.: 8,496 Status: Location: Ft Worth, TX Drives: 2005 Elantra GLS 5-door	Really??? Where does it say that? On Page 2 of Section 1, my 05 manual says: "Unleaded gasoline with a Pump Octane Rating of 87 (Research Octane Number 91) or higher must be used in your Hyundai." The Pump Octane Rating is what they put on the pump; in other words, it only needs 87 Octane (Regular gas).

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