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  #1  
Old 05-25-2011, 10:42 AM
Cdy291 Cdy291 is offline
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Default Maybe 89 octane is what I need?

Friday when I was getting gas I accidentally pressed the 89 button on the pump. Before I realized it I had already put $30 worth of the 15 cent per gallon higher gas in the tank. I stopped it there and drove off with the just past the half way mark. Before with a mix of city and hwy driving the best I had ever done was 17.5mpg, and that was with some serious grandma stuff. Since I didn't fill the tank up completely this time I won't be able to tell for sure, but I know I put 7.7 gallons in the tank just before the gas light came on. I will be getting gas soon and at this point it looks like I have done 18.4mpg, not being nearly as easy on it as the last time I did 17.5. I think this requires further investigation.
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Old 05-25-2011, 10:45 AM
Blacked Out FX4 Blacked Out FX4 is offline
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Default Re: Maybe 89 octane is what I need?

sometimes a higher octane will burn with better results and a lesser octane. Currently on a tank of regular im getting 13.3mpg. Now that I have my ultra guage im running 1 tank on regular gas, 1 tank midgrade, and 1 final tank on premium. and said results well inform me which I need to be using more.
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Old 05-25-2011, 10:49 AM
pooleo pooleo is offline
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Default Re: Maybe 89 octane is what I need?

I run 93 and I swear up and down im getting better mileage, but some folks will tell you that the engine is designed for 87 and anything more is a waste. I myself have done the math with 87 and 93, im doing better with 93. Right now im getting a solid 18 in my 4.0, all city driving. and in all reality, its only costing another $4 or so per fill up, as long as that extra $4 is giving me another 18 miles to a tank, then its paying for itself
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Old 05-25-2011, 10:50 AM
FireRanger FireRanger is offline
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Default Re: Maybe 89 octane is what I need?

It's not going to burn better. And you're not going to calculate anything without several identical trips through full tanks of gas. You have no way of calculating anything right now so your 18.4 number is totally fake. You put 7.7 gallons in a tank that already had 2-3 gallons of gas still in it so you its diluted even more. Do not expect to see any actual improvement in anything. Also, unless something is wrong with your engine, it will operate best on 87 regardless of the flashy advertising.
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  #5  
Old 05-25-2011, 10:52 AM
OhioMike OhioMike is offline
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Default Re: Maybe 89 octane is what I need?

Using a higher octane for a vehicle not meant for the upgrade can cause more harm than good. This can affect the plugs and timing. Every now and again, though, some use a higher octane instead of fuel additives because they feel it cleans the engine. To each his/her own, but remember, you are still paying much more for fuel. It could be a mere coincidence.
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Old 05-25-2011, 11:04 AM
pooleo pooleo is offline
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Default Re: Maybe 89 octane is what I need?

yes you should fill all the way up and have a known start and stop. But, even having a half a tank, you can still get a good idea of what your getting. You figure half a tank is around 10 gallon and if you pull 180 mile from the half mark to the check gauge light, you get a dam close idea that your getting around 18 mpg.
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  #7  
Old 05-25-2011, 11:07 AM
Cdy291 Cdy291 is offline
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Default Re: Maybe 89 octane is what I need?

Quote:
Originally Posted by FireRanger View Post
It's not going to burn better. And you're not going to calculate anything without several identical trips through full tanks of gas. You have no way of calculating anything right now so your 18.4 number is totally fake. You put 7.7 gallons in a tank that already had 2-3 gallons of gas still in it so you its diluted even more. Do not expect to see any actual improvement in anything. Also, unless something is wrong with your engine, it will operate best on 87 regardless of the flashy advertising.
That is why I am further investigating. I will fill it up this time at the same pump.

It has also crossed my mind that the 89 octane may have less ethanol.
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Old 05-25-2011, 11:19 AM
FireRanger FireRanger is offline
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Default Re: Maybe 89 octane is what I need?

His tank could be 16.8 gallons too so half is 8.4. Not sure if his is a short or long wheelbase. Regardless, the last gallon or two is unmetered and the last maybe 1/2 gallon or more is unusable. And regardless still, there is no way to calculate anything remotely worthwhile or remotely close without a fill-up and re-fill. And this needs to be done several times. Doing anything else is pointless and will add up to a lot of nothing.

Ethanol content will be the same. It is there for a purpose and has nothing to do with the octane rating.
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Last edited by FireRanger; 05-25-2011 at 11:23 AM.
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  #9  
Old 05-25-2011, 01:21 PM
Pietato Pietato is offline
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Default Re: Maybe 89 octane is what I need?

Well for the hell of it here's my two cents. I drive about 80-90% highway. My gauge doesn't work so i use my trip OD i fill up about ever 200-250mi and I've noticed i get between 18 and 20mpg regardless of 87 or 89. I've been doing it this way for about 4 months. I'm sure that 87 vs 89 has some difference but its so miniscule that I can't notice
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  #10  
Old 05-25-2011, 04:41 PM
Little Blue Little Blue is offline
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Default

Like I've mentioned multiple times on this site, I KNOW I get better MPG out of my truck on higher octane. And I dont care how a motor is designed, higher octane = higher eficiency and that's science and arguing against that fact is simply ignorance.

I ran a full length test. 5 full tanks of all 3 octanes with similar driving. I got better mileage as I went higher in the octanes, simple as that. If you REALY want, I can post my semi-scientific results. I kept every receipt, every odometer number, it kinda turned into a science project. That being said, the biggest factor will always be HOW YOU DRIVE.

And no, 108 octane will not give you 40 mpg smart-asses. There's technically nothing above 96(?)
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Old 05-25-2011, 06:07 PM
FireRanger FireRanger is offline
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Default Re: Maybe 89 octane is what I need?

That's nice that you think that. But theres nothing scientific about it and your claims very simply defy the science behind it. I'm not going to argue your results. But I'll repeat over and over that nobody should actually expect the same to happen to them.
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  #12  
Old 05-25-2011, 08:57 PM
Cdy291 Cdy291 is offline
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Default Re: Maybe 89 octane is what I need?

There have been documented cases in the past where stations had ethanol in the 87 and 89, but not in the 91.

There are certainly more modern engine designs where anything other than 87 is useless, but the Vulcan was designed in the mid to late 80's. Things have come a long way in fuel efficiency since then.
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Old 05-26-2011, 06:29 AM
FireRanger FireRanger is offline
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Default Re: Maybe 89 octane is what I need?

Quote:
Originally Posted by Cdy291 View Post
There have been documented cases in the past where stations had ethanol in the 87 and 89, but not in the 91.
And...? This still has nothing to do with the octane rating of the fuel. The ethanol wasn't omitted because of the octane rating. Ethanol (10%) is added to fuel for environmental reasons mandated by various government bullshit agencies. MTBE used to be used but they found it caused cancer or something (typical government operation). The MTBE was found in all grades of fuel too, because just like the ethanol, it had nothing to do with the octane rating.

I do not know why those "documented cases" of 91 not having ethanol took place. My guess is those stations served a very large amount of power equipment and power sports customers that needed that higher octane rating and where that 10% ethanol is damaging to their motors. The stations probably also had to pay fines out the ass for doing it, which they likely made up for with increased sales.s
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  #14  
Old 05-26-2011, 07:39 AM
Cdy291 Cdy291 is offline
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Default Re: Maybe 89 octane is what I need?

Quote:
Originally Posted by FireRanger View Post
And...? This still has nothing to do with the octane rating of the fuel. The ethanol wasn't omitted because of the octane rating. Ethanol (10%) is added to fuel for environmental reasons mandated by various government bullshit agencies. MTBE used to be used but they found it caused cancer or something (typical government operation). The MTBE was found in all grades of fuel too, because just like the ethanol, it had nothing to do with the octane rating.

I do not know why those "documented cases" of 91 not having ethanol took place. My guess is those stations served a very large amount of power equipment and power sports customers that needed that higher octane rating and where that 10% ethanol is damaging to their motors. The stations probably also had to pay fines out the ass for doing it, which they likely made up for with increased sales.s
And less ethanol could lead to better mpg.
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Old 05-26-2011, 07:46 AM
FireRanger FireRanger is offline
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Default Re: Maybe 89 octane is what I need?

It is ironic that they put it in there for the environment and it results in burning more fuel to do the same amount of work. It's even more ironic in E85 fuel which gets crap for economy.
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