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Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633884
01/13/18 06:44 PM
01/13/18 06:44 PM
Joined: Jun 2005
Posts: 5,251
North Texas
ARB1977 Offline
ARB1977  Offline
Joined: Jun 2005
Posts: 5,251
North Texas
Use what the manual calls for.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Re: Owners manual says use octane 87 or higher [Re: Linctex] #4633888
01/13/18 06:48 PM
01/13/18 06:48 PM
Joined: Aug 2004
Posts: 1,964
5600 feet elevation, Arizona
double vanos Offline
double vanos  Offline
Joined: Aug 2004
Posts: 1,964
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.


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: Owners manual says use octane 87 or higher [Re: double vanos] #4633903
01/13/18 07:05 PM
01/13/18 07:05 PM
Joined: Jan 2006
Posts: 1,039
Ruidoso, NM USA
ammolab Offline
ammolab  Offline
Joined: Jan 2006
Posts: 1,039
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.


2009 Honda CR-V
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: Owners manual says use octane 87 or higher [Re: GMBoy] #4633947
01/13/18 07:56 PM
01/13/18 07:56 PM
Joined: Dec 2016
Posts: 6,438
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,438
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Owners manual says use octane 87 or higher [Re: double vanos] #4633948
01/13/18 07:58 PM
01/13/18 07:58 PM
Joined: Dec 2016
Posts: 6,438
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,438
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Owners manual says use octane 87 or higher [Re: Linctex] #4634435
01/14/18 11:06 AM
01/14/18 11:06 AM
Joined: Nov 2004
Posts: 7,764
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,764
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.

Re: Owners manual says use octane 87 or higher [Re: Alex_V] #4635517
01/15/18 09:58 AM
01/15/18 09:58 AM
Joined: May 2003
Posts: 72
N. VA
Gary Offline
Gary  Offline
Joined: May 2003
Posts: 72
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.


Gary /BMW CCA '91
VWs-Hondas-BMWs E36 Mti-Acura/'14 Toyota Camry V6/'15 Lexus IS 350 F Sport
Castrol Edge/Magnatec 0w-20/BrgStn stock/Mich Pilot SS
Re: Owners manual says use octane 87 or higher [Re: ARB1977] #4636687
01/16/18 01:56 PM
01/16/18 01:56 PM
Joined: Jun 2008
Posts: 328
D-town
A_A_G Offline OP
A_A_G  Offline OP
Joined: Jun 2008
Posts: 328
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.

Last edited by A_A_G; 01/16/18 01:57 PM.
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4636738
01/16/18 02:28 PM
01/16/18 02:28 PM
Joined: Feb 2013
Posts: 10,873
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,873
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.


2015 Hyundai Sonata 2.4L 85k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4637101
01/16/18 08:09 PM
01/16/18 08:09 PM
Joined: Jun 2011
Posts: 1,758
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,758
Crawfordville FL
Try it, see what the car does. It depends on how itís programmed


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4638660
01/18/18 11:44 AM
01/18/18 11:44 AM
Joined: Dec 2009
Posts: 665
Wash, DC
circuitsmith Offline
circuitsmith  Offline
Joined: Dec 2009
Posts: 665
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.


2017 Hyundai Tucson SE FWD, 5000mi/12mo OCI
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