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#4633884 - 01/13/18 05:44 PM Re: Owners manual says use octane 87 or higher [Re: A_A_G]
ARB1977 Offline


Registered: 06/12/05
Posts: 4999
Loc: North Texas
Use what the manual calls for.
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#4633888 - 01/13/18 05:48 PM Re: Owners manual says use octane 87 or higher [Re: Linctex]
double vanos Offline


Registered: 08/05/04
Posts: 1738
Loc: 5600 feet elevation, Arizona
Originally Posted By: Linctex
Originally Posted By: slacktide_bitog

If you're in a high-altitude area or ever visit one, you still have to use 87.... they can't use the 85 offered up there and that they still have to use 87 regardless of altitude smile


This is incorrect.

High altitude = less atmospheric pressure = less cylinder filling = less need for octane.

Every gasoline engine design in existence with an option for "high altitude" is a RAISED compression ratio, because power goes down as you go higher.


Problem is: now I have a full tank of less than 87 gas thatís able to make it from my high altitude purchase site to a lower elevation, maybe even sea level. Many cars can go far enough on a tank of fuel to make that low octane purchase a warranty buster.
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#4633903 - 01/13/18 06:05 PM Re: Owners manual says use octane 87 or higher [Re: double vanos]
ammolab Offline


Registered: 01/16/06
Posts: 901
Loc: Ruidoso, NM USA
Originally Posted By: double vanos
Originally Posted By: Linctex
Originally Posted By: slacktide_bitog

If you're in a high-altitude area or ever visit one, you still have to use 87.... they can't use the 85 offered up there and that they still have to use 87 regardless of altitude smile


This is incorrect.

High altitude = less atmospheric pressure = less cylinder filling = less need for octane.

Every gasoline engine design in existence with an option for "high altitude" is a RAISED compression ratio, because power goes down as you go higher.


Problem is: now I have a full tank of less than 87 gas thatís able to make it from my high altitude purchase site to a lower elevation, maybe even sea level. Many cars can go far enough on a tank of fuel to make that low octane purchase a warranty buster.


"A warranty buster"? Never happen GI! If it worries you that much just take it EASY on the throttle until you can pump a few gallons of premium into that 86 octane swill.
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#4633947 - 01/13/18 06:56 PM Re: Owners manual says use octane 87 or higher [Re: GMBoy]
Linctex Offline


Registered: 12/31/16
Posts: 4332
Loc: Waco, TX
Originally Posted By: GMBoy
Why all the trouble mixing 1/2 of 87 and 93 to get 90? Just press the 89 button and save all that unnecessary work.


Because the cost per octane number is ridiculous, that's why.

It's cheaper to blend.
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#4633948 - 01/13/18 06:58 PM Re: Owners manual says use octane 87 or higher [Re: double vanos]
Linctex Offline


Registered: 12/31/16
Posts: 4332
Loc: Waco, TX
Originally Posted By: double vanos

Problem is: now I have a full tank of less than 87 gas thatís able to make it from my high altitude purchase site to a lower elevation, maybe even sea level. Many cars can go far enough on a tank of fuel to make that low octane purchase a warranty buster.


HUH?

What vehicle?
Most modern ECU controlled engines adjust timing & mixture to compensate just fine.
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#4634435 - 01/14/18 10:06 AM Re: Owners manual says use octane 87 or higher [Re: Linctex]
GMBoy Offline


Registered: 11/22/04
Posts: 7614
Loc: Texas
Originally Posted By: Linctex
Originally Posted By: GMBoy
Why all the trouble mixing 1/2 of 87 and 93 to get 90? Just press the 89 button and save all that unnecessary work.


Because the cost per octane number is ridiculous, that's why.

It's cheaper to blend.



True - Cheaper by $2. Shell near me is 2.19 for 87, 2.69 for 89 and 2.99 for 93. If you took 20 gallons to fill up it would cost you $51.80 split 10 gal 87 and 10 gal 93 or $53.80 straight 20 gal of 89.

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#4635517 - 01/15/18 08:58 AM Re: Owners manual says use octane 87 or higher [Re: Alex_V]
Gary Offline


Registered: 05/08/03
Posts: 71
Loc: N. VA
Originally Posted By: Alex_V
My Cruze is a port-injected gas, turbo I-4 with 9.5:1 compression - it's technically an 87 engine but the results every time I've put regular in it tell me it likes 89 or better a WHOLE lot more. Run at least a full tank, or several, of 89 or premium in it, then pump a bunch of regular in it and see if you notice a difference in idle quality and acceleration.


The higher is useless if 87 spec'ed doesn't necessarily apply to turbos as you've noticed. You may have even more power / response at 93. I go for that over watching MPG.
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#4636687 - 01/16/18 12:56 PM Re: Owners manual says use octane 87 or higher [Re: ARB1977]
A_A_G Offline


Registered: 06/13/08
Posts: 308
Loc: D-town
Originally Posted By: ARB1977
Use what the manual calls for.


Yeah...that would be great if the manual was a little more detailed...

"Fuel recommendation: Unleaded gasoline with pump octane number 87 or higher required"

It mentions nothing about why a higher octane should be used.


Edited by A_A_G (01/16/18 12:57 PM)

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#4636738 - 01/16/18 01:28 PM Re: Owners manual says use octane 87 or higher [Re: A_A_G]
Nick1994 Offline


Registered: 02/19/13
Posts: 9274
Loc: Phoenix, AZ
Originally Posted By: A_A_G
I don't mind running 89 since I already do in my two other vehicles. I'm more worried about getting the best fuel economy out of it.


The average cost of 87 octane fuel is $2.53 per gallon and 89 octane fuel is $2.81. A difference of $0.28 per gallon, or 11% more. If you get 31 mpg with 87 octane, youíd need to get 34.4 mpg on 89 octane just to break even.

Itís like driving a diesel vehicle trying to save money, in some instances it can happen, but the fuel cost is so much more, it better get WAY better fuel economy to start making sense, as far as saving money on fuel.
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#4637101 - 01/16/18 07:09 PM Re: Owners manual says use octane 87 or higher [Re: A_A_G]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1344
Loc: Crawfordville FL
Try it, see what the car does. It depends on how itís programmed
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#4638660 - 01/18/18 10:44 AM Re: Owners manual says use octane 87 or higher [Re: A_A_G]
circuitsmith Offline


Registered: 12/17/09
Posts: 589
Loc: Wash, DC
My Matrix runs a little peppier with 89 octane when the ambient temp is above 90F.
Doesn't improve MPGs though.
On a road trip to see the eclipse I got to run some 89 octane ethanol free (cheap in South Carolina) and got 40 MPG.
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