1. Welcome to Tundras.com!

    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 Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

what gas do you put in your flex fuel?

Discussion in 'General Tundra Discussion' started by wigburner, Sep 9, 2019.

  1. Sep 9, 2019 at 9:15 AM
    #1
    wigburner

    wigburner [OP] New Member

    Joined:
    May 18, 2019
    Member:
    #30696
    Messages:
    67
    Vehicle:
    09 double cab 5.7
    does higher octane gas have any advantages on an engine designed for Flex Fuel?
     
  2. Sep 9, 2019 at 9:39 AM
    #2
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    1,835
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    Nope I just run 87 octane E10
     
    10TundraSR5 likes this.
  3. Sep 9, 2019 at 9:49 AM
    #3
    TundraLaw

    TundraLaw New Member

    Joined:
    Oct 24, 2017
    Member:
    #10505
    Messages:
    433
    Gender:
    Male
    Northern Nevada
    Vehicle:
    Had 17 Tundra CM SR5 UP. Audi. Now 19 Limited
    doesn't really change anything. Our Flex Fuel engines just have a few less corrosive components that are better suited to handle the extremely corrosive ethanol if you were to put in E15. I run 87 sometimes and mostly ethanol free 87 just for fun.
     
  4. Sep 9, 2019 at 10:35 AM
    #4
    NewImprovedRon

    NewImprovedRon "220, 221- WHATEVER IT TAKES" - Michael Keaton

    Joined:
    Jul 8, 2015
    Member:
    #1501
    Messages:
    10,971
    Gender:
    Male
    First Name:
    Ron
    Bentonville, AR
    Vehicle:
    2015 Radiant Red TSS Doublecab 4X4 Off Road
    Deck rail system, Bed divider, door sill protectors, LED reverse light bars, Aries Bull Bar with 28" 180 watt LED light bar, LED step lights, LED bed lights, driver-side grab handle, TRD Rear Sway Bar, BedRug bed mat and tailgate mat, Morimoto Fog Lights, more to come.....
    I know I'm probably wasting my hard-earned dollars but I normally fill up with 89 octane...
     
    duece292 likes this.
  5. Sep 9, 2019 at 10:41 AM
    #5
    duece292

    duece292 Pennsylvania Hillbilly Deluxe

    Joined:
    Mar 13, 2017
    Member:
    #6776
    Messages:
    1,717
    Gender:
    Male
    First Name:
    Greg
    Green Bay, WI
    Vehicle:
    2013 Tundra SR5 CM TRD 5.7 4X4
    I usually run 89 as well. The gas station I go to has no ethanol 89. Corn is for feeding critters, not trucks.
     
  6. Sep 9, 2019 at 10:57 AM
    #6
    DarthMurdicide

    DarthMurdicide Executive Redneck

    Joined:
    Jul 21, 2018
    Member:
    #17251
    Messages:
    325
    Gender:
    Male
    First Name:
    John
    South Carolina
    Vehicle:
    2018 Tundra Limited CM Premium Package
    Here’s an analysis I did based on fuel prices from a while back...

    26 gallons x $.40/gallon E-85 savings = $10.40 total savings per fillup using E-85
    Loss of 2 MPG x 26 gallons = 52 miles lost per tank using E-85
    52 miles divided by 13 MPG = 4 gallons lost per tank using E-85
    4 gallons x AAA average Texas cost of regular $2.52/gallon = $10.08

    If my math is right, if I were you, I'd stick with 86/87 octane...less wear and tear on your fuel system, even though it is designed to run E-85 (i.e. Flex Fuel). I have Flex Fuel as well, and it's cheaper per gallon, but not cheaper per tank.
     
    NewImprovedRon likes this.
  7. Sep 9, 2019 at 11:46 AM
    #7
    wigburner

    wigburner [OP] New Member

    Joined:
    May 18, 2019
    Member:
    #30696
    Messages:
    67
    Vehicle:
    09 double cab 5.7
    ive not once put E-85 because i can find it mostly.
    so i run 86/87depending which state i'm in.

    but was wondering if i should run or it premium or is that just waste?
     
  8. Sep 9, 2019 at 1:03 PM
    #8
    Stumpjumper

    Stumpjumper New Member

    Joined:
    Sep 15, 2016
    Member:
    #4546
    Messages:
    1,835
    Gender:
    Male
    Fate, Tx
    Vehicle:
    2017 Tundra TSS 4x4
    Yep, blowing it out the tail pipe
     
    lewi3069 likes this.
  9. Sep 10, 2019 at 8:21 AM
    #9
    Stig

    Stig New Member

    Joined:
    May 29, 2016
    Member:
    #3475
    Messages:
    453
    Better output at high elevation
     
    TundraLaw and NewImprovedRon like this.
  10. Sep 10, 2019 at 8:44 AM
    #10
    TundraLaw

    TundraLaw New Member

    Joined:
    Oct 24, 2017
    Member:
    #10505
    Messages:
    433
    Gender:
    Male
    Northern Nevada
    Vehicle:
    Had 17 Tundra CM SR5 UP. Audi. Now 19 Limited
    very true. I live at 4600-5000 ft elevation, and everything is a hill lol. You dont really ever expect to do 0-60 that fast, but when you put in 91 you feel it instantly. Better mpg with ethanol free though.
     
  11. Sep 10, 2019 at 4:59 PM
    #11
    wigburner

    wigburner [OP] New Member

    Joined:
    May 18, 2019
    Member:
    #30696
    Messages:
    67
    Vehicle:
    09 double cab 5.7
    so when i'm going up to 10k/13k
    filler up with high octane ?
    to help me up Imogene Pass?
     
  12. Sep 10, 2019 at 5:01 PM
    #12
    MadMaxTX

    MadMaxTX New Member

    Joined:
    Aug 9, 2019
    Member:
    #34381
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2018 Black Tundra 1794
  13. Sep 10, 2019 at 5:14 PM
    #13
    gdisarray

    gdisarray Short term member

    Joined:
    May 26, 2019
    Member:
    #31028
    Messages:
    276
    Gender:
    Male
    Vehicle:
    MGM SR5 TSS
    Why does toyota recommend oil change every 5k on flex engines? 10k for regular gasoline.
     
  14. Sep 10, 2019 at 5:18 PM
    #14
    MadMaxTX

    MadMaxTX New Member

    Joined:
    Aug 9, 2019
    Member:
    #34381
    Messages:
    10
    Gender:
    Male
    Vehicle:
    2018 Black Tundra 1794
  15. Sep 10, 2019 at 7:27 PM
    #15
    kcaustin66

    kcaustin66 New Member

    Joined:
    Jan 23, 2018
    Member:
    #12407
    Messages:
    405
    Gender:
    Male
    First Name:
    kevin
    Palestine Texas (East Texas)
    Vehicle:
    2015 Toyota Tundra CM 1794 4wd
    3” lift, black step bars, aftermarket wheels, LT305/55R20 was this way when I brought it.
    I use the 87 octane most of the time and about every 3-4 tanks I will use super
     
  16. Sep 11, 2019 at 4:16 AM
    #16
    bigandtall

    bigandtall New Member

    Joined:
    Aug 21, 2019
    Member:
    #34941
    Messages:
    37
    Gender:
    Male
    Indianapolis Motor Speedway

    No, the engine is every 5K unless using flex fuel, then it's every 2.5K. The non flex fuel engine says up to 10K miles. For some reason the particular code of engine for flex fuel build is 5K max interval.
     
    NewImprovedRon likes this.
  17. Sep 11, 2019 at 4:56 AM
    #17
    10TundraSR5

    10TundraSR5 New Member

    Joined:
    Oct 22, 2018
    Member:
    #20824
    Messages:
    329
    Gender:
    Male
    87 octane. I've ran 93 once and I think I could tell a difference but not worth doing it every fill up. NO E-85.
     

Products Discussed in

To Top