1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

The minimum octane rating gasoline that should be used in my vehicle

Discussion in 'Technical Chat' started by genxer36, Apr 9, 2009.

  1. Jan 11, 2011 at 7:07 PM
    #21
    GiverDeaner

    GiverDeaner Member

    Joined:
    Jan 3, 2011
    Member:
    #48688
    Messages:
    15
    Gender:
    Male
    First Name:
    Kevin
    Kamloops,BC
    Vehicle:
    Nicest 2ndGen in town Wannabe
    3"lift,33/11.5's,TRD Bronze rims,HID fogs and headlights,All LED's,Black front lip,Fogs on when high beams on mod.
    The way understand it is that modern engine managment systems control the ignition timing by advancing the timeing to the point of spark knock then retard it slightly as to not cause damage to the engine.The vehicles ecu is doing this many times a second.Like most all things that the ecu monitors and controls in todays cars it is for reducing emissions.The more spark advance the more power(to a certain point).The harder the piston is pushed down the less fuel needed for a given unit of work.Or something like that.
     
  2. Feb 8, 2011 at 7:25 PM
    #22
    glwood6

    glwood6 Well-Known Member

    Joined:
    Jul 25, 2008
    Member:
    #8125
    Messages:
    1,600
    Gender:
    Male
    First Name:
    Gary
    Albuquerque, NM
    Vehicle:
    '13 MGM AC 4x4 TRD OR
    Husky front mud flaps, OEM bed mat, 3D floor mats, Wet Okole seat covers, fog lights anytime mod, rear diff breather extension, aluminum Relentless tailgate reinforcement, NWexpo corner gussets, 265/75-16 Hankook Dynapro ATM
    In the altitude of Albuquerque, it seems that they use 86 octane for regular, 88 for mid-range and 90 for premium. I have used mid range for the last few years, but I filled up with regular on a tank not that long ago, and I cannot tell any difference...is 86 acceptable?
     
  3. Feb 8, 2011 at 7:32 PM
    #23
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

    Joined:
    Dec 17, 2008
    Member:
    #11677
    Messages:
    7,959
    Gender:
    Male
    First Name:
    Joe
    NJ
    Vehicle:
    05 Tacoma TRD Sport
    stock, for now
    i use mid grade(89).lasts longer then regular, and premimum is to expensive.
     
  4. Mar 2, 2011 at 7:03 PM
    #24
    zuckdan

    zuckdan Well-Known Member

    Joined:
    Feb 15, 2011
    Member:
    #51233
    Messages:
    50
    Gender:
    Male
    Evergreen CO
    Vehicle:
    2011 DC SR5
    out here in colorado we have 85 octane. been using that on my brand new 2011 v6 for three tankfulls. i live at 7500 ft and most of my driving takes me higher and higher and higher. Just hit $3.06 for 85 octane
     
  5. Mar 21, 2011 at 5:51 PM
    #25
    KevLot17

    KevLot17 Well-Known Member

    Joined:
    Jun 30, 2010
    Member:
    #39621
    Messages:
    694
    Gender:
    Male
    First Name:
    Kevin
    Pennsylvania
    Vehicle:
    '10 Blacked Out TRD Sport
    Debadged, Toytec Ultimate Lift, Banks Monster Exhaust, AFE Pro Dry filter, Black Grillecraft grille, Flat Black background headlights, Red Blinkers and markers with alternating turn signal mod, Krypton Bulbs 6000K Headlights and Fogs, Fog Light anytime Mod, LED interior lights with map light mod, AVS Black Taillight Covers, Tinted Windows, WeatherTech Digital floor liners.
    ok i just found this thread and i feel like i should put my 2 cents in for anyone that is still sub'd or looks at it in the future.... fuel prices recently spiked as we all know, here in NEPA, were paying $3.59(87) $3.69(91) and $3.79(93)

    So here are all of my culculations and inputs..

    First off, in ANY 'small engine', (i.e. Lawnmower, weedwacker, ATV, etc) if the fuel in your area contains ANY bit of Ethanol, never use anything less than 93 octane. Ethanol breaks down and leaves deposits in the carburator and makes it run like crap or not run at all (seen this in my 400EX AND my brand new pressure washer, also in my buddies lawnmower) when i fill up a 5 gallon jug with 93 i always add a few ounces of Sta-Bil Ethanol treatment. This has helped everything run way better.

    Next, in my Tacoma...
    87 octane w/ 10% ethanol, 17.5 Avg MPG
    91 octane, 18.9 MPG

    SAME driving styles, same roads/speeds everyday so please no (Negative) input stating im probably doing different things.
    With these statistics, ive calculated how much it cost per gallon.
    I am saving 1 Cent PER MILE
    Doesnt seem like much, but in 100 Miles thats $1.
    So in each fill up thats $3
    I Avg 20-22K miles per year, you will save an estimated $200.
    with the economy these days.. ill take 1 Cent per mile!!!!!!

    (Edited)
     
  6. Mar 26, 2012 at 9:22 PM
    #26
    Cadha13

    Cadha13 初音ミク #1 Fan, and Bacon Wrapped Hot Dog Cook

    Joined:
    Mar 14, 2012
    Member:
    #74868
    Messages:
    32
    Gender:
    Male
    First Name:
    David
    Albuquerque
    Vehicle:
    07 PreRunner V6 SR5 Double Cab
    I read in a owner's manual for a 1986 Caprice and in a manual for a 2000 Impala (it's old, but the car had electronic spark control not much different than any Tacoma) saying that higher the altitude the lower the octane reading you can use, but I see a pattern that the gas at say, LA has a higher minimum octane rating than say here at the 5000 ft altitude of Albuquerque, NM. From what I figure that the higher air densities require higher octane levels to prevent knock same for any higher compression or supercharged car. This makes sense from what the manuals are saying.
     
  7. Apr 15, 2012 at 2:23 PM
    #27
    Dcd5907

    Dcd5907 Well-Known Member

    Joined:
    Nov 26, 2011
    Member:
    #67732
    Messages:
    162
    Gender:
    Male
    First Name:
    Anthony
    Southern NY
    Vehicle:
    '11 Tacoma AC V6 4x4 MT
    Fog install, tinted, de-badged, relentless skids, beefed sliders, CBI spare tire carier, SCS F5's, color matched grill, GY Duratrac's,
    Keeping tight records using fuelly I noticed this, using 87 engien runs a bit ruff, under load or highway driving it prob runs like its meant to. Mpgs averaged fro 17 to 19. Using 89 smoothed out at idle and highway cruising speeds and yielded same mpg, next I mooved to 91, same smoothness with 87 but deff felt like I lost bottom end power but gained top end. 3.25 k and up when u punch it out it's almost like I add a power added or somthing. My mpgs also averaged from 18 to 22. Next I tried 93, deff increese in top end but mpg stayed around the same.
    This was all don using shell gas the same station using the same pump in southern ny. Over a 4 month span. When between octanes I ran the truck till the light came on and didn't record my results till the next fill up.
     
  8. Jul 1, 2013 at 10:14 PM
    #28
    mr2mki

    mr2mki Well-Known Member

    Joined:
    Jul 1, 2013
    Member:
    #107429
    Messages:
    215
    Gender:
    Male
    Note that the key is the altitude. Those of you who live at sea level, don't try 85 octane :)
     
  9. Jan 20, 2014 at 8:06 AM
    #29
    LazyLightning

    LazyLightning Member

    Joined:
    Jan 7, 2014
    Member:
    #120099
    Messages:
    14
    Gender:
    Male
    Nor Cal
    3" lift
    Interesting comments. I have a 2014 DC. When I first purchased it I was running high octane. Then I switched to low octane and I swear the truck runs better. Some factors to consider.... I'm at sea level, truck only has 1,200 miles on it, I'm in CA.
     
  10. Feb 6, 2014 at 3:28 PM
    #30
    Johnny2525

    Johnny2525 Well-Known Member

    Joined:
    Jan 31, 2014
    Member:
    #121970
    Messages:
    151
    Gender:
    Male
    California
    Vehicle:
    '14 TRD OFF ROAD DCSB
    ICON stage 3 suspension kit, Amp Research retractable steps, LED interior lighting, MB wheels, FlowMaster exhaust. Rigid Industries back up lights
    My 2014 Tacoma manual says DO NOT use 91 Octane.
     
  11. Feb 6, 2014 at 3:28 PM
    #31
    Johnny2525

    Johnny2525 Well-Known Member

    Joined:
    Jan 31, 2014
    Member:
    #121970
    Messages:
    151
    Gender:
    Male
    California
    Vehicle:
    '14 TRD OFF ROAD DCSB
    ICON stage 3 suspension kit, Amp Research retractable steps, LED interior lighting, MB wheels, FlowMaster exhaust. Rigid Industries back up lights
    My 2014 Tacoma manual says DO NOT use 91 Octane
     
  12. Feb 6, 2014 at 3:35 PM
    #32
    OZ-T

    OZ-T Thats what it is to be a slave ...

    Joined:
    Dec 15, 2009
    Member:
    #27584
    Messages:
    36,890
    Gender:
    Male
    First Name:
    Peter North
    British Columbia
    Vehicle:
    Mag Grey 09 Trd Sport DCLB 4x4
    OME 885x , OME shocks and Dakars , Wheelers SuperBumps front and rear , 275/70/17 Hankook ATm , OEM bed mat , Weathertech digifit floor liners , Weathertech in-channel vents , headache rack , Leer 100RCC commercial canopy , TRD bedside decals removed , Devil Horns by Andres , HomerTaco Satoshi

    wut

    Post a pic
     
  13. Feb 7, 2014 at 7:40 AM
    #33
    Johnny2525

    Johnny2525 Well-Known Member

    Joined:
    Jan 31, 2014
    Member:
    #121970
    Messages:
    151
    Gender:
    Male
    California
    Vehicle:
    '14 TRD OFF ROAD DCSB
    ICON stage 3 suspension kit, Amp Research retractable steps, LED interior lighting, MB wheels, FlowMaster exhaust. Rigid Industries back up lights
    Sorry man, i lied...I hate it when that happens. It just says to research 91 or higher. I have a reading lesson tomorrow.
     
  14. Mar 22, 2014 at 10:29 PM
    #34
    rileySB

    rileySB RileySB

    Joined:
    Apr 8, 2013
    Member:
    #101692
    Messages:
    665
    Gender:
    Female
    First Name:
    Gen
    Santa Barbara, CA
    Vehicle:
    13 DCSB OR 4x4
    5100/887, Dakars, 285s, Built Right UCAs, Icon rears
    Just got back from a road trip in Utah. Found it odd that they sell 85 octane. My first tank in Utah I got so excited by the cheap price of gas 3.39 for the reg unleaded and I was so sleep deprived that I filled up using 85. Thankfully had thrown in a Techron Fuel Injector cleaner (not sure if it helps with the low octane) with that tank so I feel better about using sub-par octane in my 2013. Just curious if any utah tacoma drivers actually use the 85 octane.
     
  15. Mar 22, 2014 at 10:38 PM
    #35
    worthywads

    worthywads Well-Known Member

    Joined:
    Jun 25, 2011
    Member:
    #58841
    Messages:
    3,869
    Gender:
    Male
    Peoples Republic of Boulder
    Vehicle:
    05 5-lug access I4 Stick, 70 Challenger Vert
    Yes, no need for higher at altitude.
     
  16. Aug 18, 2015 at 6:16 AM
    #36
    bluesttape

    bluesttape Well-Known Member

    Joined:
    Mar 30, 2014
    Member:
    #126588
    Messages:
    124
    Gender:
    Male
    Denver
    Vehicle:
    '14 TRD Sport DCSB
    Debadged 3in Lift KO2s 275/70/17 OEM Stock Rims w/TRD Center Caps TRD Cap-Back Exhaust Avid Light Bar A.R.E. CX Cap OEM Nerf Bars OEM Rack on Cab Thule Rack on Cap WeatherTech Floor-liners WeatherTech Vent Visor CoverKing Seat Covers Chicco Keyfit 30 :-) Clifford 5806x Alarm & Remote Start LED Replaced (dome,map,flasher, reverse, & parking) Salex Organizer in Glove Box & Center Console Fully Tinted 12in ClearBra
    oh boy... I have a 2014 DCSB and love it. After getting horrible gas mileage for the for 20k miles I thought would look up what the issue may be. Turns out the guy that sold me the truck may have been full of $h!t. When I asked what kind of gas I needed he said 'regular'. This was news to my ears since my 6cyl Subaru took premium... uh oh...

    Here is Colorado 'regular' is 85, even at Costco...

    So, it seems that after reading all of this it seems that I have been using the wrong gas...

    Is that correct?

    Also, Costco doesn't carry mid-grade, should I just use premium?
     
  17. Aug 22, 2015 at 12:46 PM
    #37
    Johnny2525

    Johnny2525 Well-Known Member

    Joined:
    Jan 31, 2014
    Member:
    #121970
    Messages:
    151
    Gender:
    Male
    California
    Vehicle:
    '14 TRD OFF ROAD DCSB
    ICON stage 3 suspension kit, Amp Research retractable steps, LED interior lighting, MB wheels, FlowMaster exhaust. Rigid Industries back up lights
    These trucks are set up for 87. If you put anything higher than that in the computer adjusts for it and does something to the timing. That's what the service dept. told me. It doesn't hurt anything to go with a higher octane but you're wasting money.
     
    bluesttape likes this.
  18. Sep 10, 2015 at 12:29 PM
    #38
    syswalla

    syswalla Knob

    Joined:
    Aug 19, 2015
    Member:
    #162191
    Messages:
    1,685
    Gender:
    Male
    5547 ft.
    Vehicle:
    2015 TRD DCSB Off Road
    Since you live at 5000+ ft 85 is the same as 87 at low altitude. Colorado AAA gives an explanation:

    "Colorado is among a group of states where regular unleaded gasoline has a lower octane level (85) than is normal elsewhere in the country (87)."
     
    bluesttape likes this.
To Top