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Owners manual says use octane 87 or higher #4633554
01/13/18 11:32 AM
01/13/18 11:32 AM
Joined: Jun 2008
Posts: 329
D-town
A_A_G Online content OP
A_A_G  Online Content OP
Joined: Jun 2008
Posts: 329
D-town
This is for a 2017 Honda HRV and it has a surprisingly "high" compression ratio of 10.6:1 with only port injection. Is this a case where it'll run on 87, but it'll run better with a higher octane?

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.

Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633561
01/13/18 11:39 AM
01/13/18 11:39 AM
Joined: Dec 2006
Posts: 19,141
Dallas,Tx USA
aquariuscsm Online content
aquariuscsm  Online Content
Joined: Dec 2006
Posts: 19,141
Dallas,Tx USA
Only if it specifies "Premium Unleaded Fuel Only".


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633563
01/13/18 11:39 AM
01/13/18 11:39 AM
Joined: Mar 2016
Posts: 1,591
Toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,591
Toronto
Try running the 87 and 89 back to back and see if you actually get better fuel economy from one of them


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633564
01/13/18 11:40 AM
01/13/18 11:40 AM
Joined: Mar 2008
Posts: 7,349
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,349
USA
87 is just fine for that engine, which isn't turbo or DI smile

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

Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633570
01/13/18 11:51 AM
01/13/18 11:51 AM
Joined: Mar 2014
Posts: 3,488
NJ
Leo99 Online content
Leo99  Online Content
Joined: Mar 2014
Posts: 3,488
NJ
You have to do the math to see if any increase in fuel economy is offset by the increased cost of higher octane fuel.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: Owners manual says use octane 87 or higher [Re: slacktide_bitog] #4633579
01/13/18 12:02 PM
01/13/18 12:02 PM
Joined: Jan 2003
Posts: 894
Colorado
newtoncd8 Offline
newtoncd8  Offline
Joined: Jan 2003
Posts: 894
Colorado
Originally Posted By: slacktide_bitog
87 is just fine for that engine, which isn't turbo or DI smile

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



Don't want to derail this thread, but according to Exxon Mobil (from 2013) that is still up for debate ... and there have been no changes since:

"ASTM is also addressing this issue and a ballot to remove the discussion regarding altitude adjustments was issued last fall and addressed at the December meeting. There were a number of negatives submitted for a variety of reasons, but predominantly because there was almost no pertinent data presented that the octane requirement adjustment for altitude was invalid. It was decided to withdraw the ballot and, instead, move forward with some scientifically designed experiments to elucidate the subject."


12 Jeep GC, 04 Lexus RX330, 77 MG-B
11 Audi A4, 01 Audi A4
99 Lexus ES300, 98 Isuzu Trooper
94 & 91 Acura Integra, 88 Toyota Camry,
84 Honda Accord, 70 Pontiac LeMans,
62 Ford Galaxy 500
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633588
01/13/18 12:16 PM
01/13/18 12:16 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633631
01/13/18 01:00 PM
01/13/18 01:00 PM
Joined: Nov 2011
Posts: 4,978
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,978
MTL, CANADA
Use regular 87 octane. My 1ZZFE has a 10.0/1 ratio. Dont see much diff running higher. The cost of higher octane wont give you the equivalent in better mpg. Ie. Paying 20% more for 93 octane wont give u 20% better mileage.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633638
01/13/18 01:11 PM
01/13/18 01:11 PM
Joined: Jun 2003
Posts: 33,595
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,595
ME
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.


Unless you have your own farm tank what difference does it make? Press the 87 button when you get to the station.

Dodge used to advertise "peak" HP which was unlocked by higher-than-regular fuel. They rated their cars with the EPA on regular, though. How they had their cake and ate it too.

Realistically this is an experiment you may have to do yourself. Consider it in the summer at least, the worst time for knock retard.

Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633642
01/13/18 01:14 PM
01/13/18 01:14 PM
Joined: Dec 2002
Posts: 4,260
The Garden State
Whimsey Offline
Whimsey  Offline
Joined: Dec 2002
Posts: 4,260
The Garden State
Our 2.3 EB Explorer requires a minimum of of 87 octane fuel. The OM says that best overall and vehicle performance is achieved using 91 octane fuel. This is especially in high temperatures and conditions such as towing. I'm guessing in other conditions such as mountainous driving, especially in hot temps this applies. Considering premium fuel costs between $0.50 to $1.00 per gallon more than 87 octane fuel and my engine performance and mpg have been more than satisfactory with 87 octane for regular everyday driving overall that's what I'll use. For our June trip to Key West from NJ I'll do what I did last year and make a 90 octane mix using 1/2 87 octane and 1/2 93 octane.

Whimsey

Re: Owners manual says use octane 87 or higher [Re: eljefino] #4633654
01/13/18 01:23 PM
01/13/18 01:23 PM
Joined: Jun 2008
Posts: 329
D-town
A_A_G Online content OP
A_A_G  Online Content OP
Joined: Jun 2008
Posts: 329
D-town
Originally Posted By: eljefino
Unless you have your own farm tank what difference does it make?


They are older vehicles with high/very high miles (10 years - 147k & 16 years - 231k). Both ping on 87 so I switched them to 89 and it stopped.

Last edited by A_A_G; 01/13/18 01:24 PM.
Re: Owners manual says use octane 87 or higher [Re: slacktide_bitog] #4633666
01/13/18 01:38 PM
01/13/18 01:38 PM
Joined: Dec 2016
Posts: 7,201
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 7,201
Waco, TX
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.


"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: A_A_G] #4633673
01/13/18 01:42 PM
01/13/18 01:42 PM
Joined: Aug 2012
Posts: 169
Central Florida
StevieBoy Offline
StevieBoy  Offline
Joined: Aug 2012
Posts: 169
Central Florida
I believe that a higher compression engine will perform better with a higher octane gas. Even if it doesn't get better gas mpg. I also like to make my own blend of 90 octane by mixing 87 & 93. For the same price or less than 89 octane, I get higher octane. And if using gas with more detergent in premium, I get cleaner injectors.


2018 Grand Cherokee Limited
25th Anniversary Sterling Edition
Re: Owners manual says use octane 87 or higher [Re: A_A_G] #4633757
01/13/18 03:17 PM
01/13/18 03:17 PM
Joined: Jan 2013
Posts: 1,420
America's Dairyland
LotI Offline
LotI  Offline
Joined: Jan 2013
Posts: 1,420
America's Dairyland
My 13:1 SkyActiv is happy on 87. I put 60k miles on an Accord 2.4l using 87 exclusively.

Save your money.

My VFR likes premium but is only 11.8:1


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
17 VW GTI
[IMG]http://badges.fuelly.com/images/sig-us/803455.png[/IMG]
Re: Owners manual says use octane 87 or higher [Re: Whimsey] #4633786
01/13/18 03:45 PM
01/13/18 03:45 PM
Joined: Nov 2004
Posts: 7,808
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,808
Texas
Originally Posted By: Whimsey
Our 2.3 EB Explorer requires a minimum of of 87 octane fuel. The OM says that best overall and vehicle performance is achieved using 91 octane fuel. This is especially in high temperatures and conditions such as towing. I'm guessing in other conditions such as mountainous driving, especially in hot temps this applies. Considering premium fuel costs between $0.50 to $1.00 per gallon more than 87 octane fuel and my engine performance and mpg have been more than satisfactory with 87 octane for regular everyday driving overall that's what I'll use. For our June trip to Key West from NJ I'll do what I did last year and make a 90 octane mix using 1/2 87 octane and 1/2 93 octane.

Whimsey



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.

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