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What fuel best 5.7

Discussion in 'Performance and Tuning' started by XFordGuy, Nov 23, 2018.

  1. Nov 23, 2018 at 7:46 PM
    #1
    XFordGuy

    XFordGuy [OP] In memory of my Tacoma’s 95-2019

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    My 2019 has 200 miles on it I’m about to need to go get fuel anybody can tell the difference between 91 octane in 87 as far as mileage goes? What does everybody putting in them? My 05 Tacoma I had 91 fed to it it’s for 13 years not sure if it was worth it or not?
     
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  2. Nov 23, 2018 at 7:57 PM
    #2
    Rica25

    Rica25 Got Bam? IG ......@TNDRA08

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    I do 18 gallons of 89 and 3 gallons of E85 at every fuel up
     
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  3. Nov 23, 2018 at 8:01 PM
    #3
    Black Wolf

    Black Wolf Bigfoot Hunter, Sasquatch too, but not Yeti

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    I use 87 pure dino most of the time with my stock tune. 91 is a waste of $ with stock tune.
     
  4. Nov 23, 2018 at 8:06 PM
    #4
    XFordGuy

    XFordGuy [OP] In memory of my Tacoma’s 95-2019

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    Cool thanks guys appreciate it I read a couple other threads that all pretty much said the same thing I spend the saved money on my new shell!,
     
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  5. Nov 23, 2018 at 8:19 PM
    #5
    Trd307

    Trd307 New Member

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    Show us your truck! And please. Post more . I like reading your posts .
     
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  6. Nov 24, 2018 at 1:27 PM
    #6
    curt37

    curt37 New Member

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    87 oct. that's what is tuned for, anything else is a waste of money
     
  7. Nov 24, 2018 at 1:30 PM
    #7
    XFordGuy

    XFordGuy [OP] In memory of my Tacoma’s 95-2019

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    Cool appreciate it thank you
     
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  8. Nov 24, 2018 at 3:18 PM
    #8
    Blueknights75

    Blueknights75 040 IS THE FASTEST

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  9. Nov 24, 2018 at 4:08 PM
    #9
    wmchaseb

    wmchaseb New Member

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  10. Nov 30, 2018 at 7:43 PM
    #10
    alpinepro4

    alpinepro4 What is your MPG Today!

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    91 with DAP Tune
     
  11. Dec 5, 2018 at 9:19 AM
    #11
    tundras00

    tundras00 New Member

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    I went for 93 to see if there was a difference and my truck runs smoother. What was interesting was what the DAP tuning had to say about it. If these trucks like to pull timing on 87, I'd rather fill up with 93.

    Screen Shot 2018-12-05 at 11.17.12 AM.jpg
     
  12. Dec 5, 2018 at 9:31 AM
    #12
    Field Walker

    Field Walker New Member

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    87. The good engineers at Toyota spent a lot of time and effort to build you an engine that is fairly rugged and has proven to be a workhorse (there are exceptions to every situation). It would be wise to heed their advice on the minimum requirements for fuel and maintenance intervals
     
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  13. Dec 5, 2018 at 9:04 PM
    #13
    tundras00

    tundras00 New Member

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    Minimum requirement is just that, a minimum requirement. If it's pulling timing at 87 and at 93 it's pulling a whole lot less, I feel better at 93. Lexus has a requirement of 93 for same engine. You also have to remember that not many will buy a truck that is advertised as 93 only.
     
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  14. Dec 5, 2018 at 9:15 PM
    #14
    computeruser6

    computeruser6 Gott Mit Uns

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  15. Dec 6, 2018 at 1:56 PM
    #15
    rt_tundra_co

    rt_tundra_co I'll get tired of tweaking this truck...never

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    How about us mountain dwellers in Colorado (high altitude)? We have 85 - 87 - 91 octane at our pumps. Can I translate, "87" as, "minimum regular octane fuels available at the pump"?
     
  16. Dec 6, 2018 at 7:58 PM
    #16
    white_sherpa

    white_sherpa New Member

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    Agree 100%. Prior going SC, I was using 91 and noticed a different in engine behavior after several tanks of 91. The timing/retard is the biggest difference with going to 91. Agree with Toyota engineering, but 87 are minimums, just like 0w-20 on oil weight recommend for 2014+, where as; I've been running 5w-30 ever since I purchased the vehicle. There are always opionins with anything that is discussed (thankful for forums), just as I've provided mine.
     
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  17. Dec 8, 2018 at 8:04 AM
    #17
    fastarget

    fastarget New Member

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    I think 87 is ok due to the elevation, but I am interested in this topic, since not only we deal with elevation, heat extremes and cold extremes as well....
     
  18. Dec 8, 2018 at 3:45 PM
    #18
    rt_tundra_co

    rt_tundra_co I'll get tired of tweaking this truck...never

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    Is anyone using a fuel system cleaner? If so, which one do you like best?
     
  19. Dec 9, 2018 at 11:22 AM
    #19
    white_sherpa

    white_sherpa New Member

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    I've used "Chevron Techron" cleaner from time to time.
     
  20. Dec 9, 2018 at 11:46 AM
    #20
    Lake.Life24

    Lake.Life24 New Member

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    Go with non-ethanol if you can. I have a local station that has 90 non-ethanol. I have consistently seen a 1 to 1.5 mpg improvement. I wouldnt be so considered with octane and go for the least % of ethanol you can find.
     
  21. Dec 14, 2018 at 6:24 AM
    #21
    10TundraSR5

    10TundraSR5 Happy Tundra owner

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    Curse you Perry the Platypus!
    Toyota says 87, I go with 87.
     
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  22. Dec 18, 2018 at 11:11 PM
    #22
    MGM

    MGM New Member

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    I have the option of 87,89,92 non-ethanol around my area. Would filling up with 92 over 87 provide better mpg?
     
  23. Dec 19, 2018 at 1:36 AM
    #23
    Blueline

    Blueline New Member

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    My wife’s Acura RDX requires 91, and my BMW X3 M40i requires 91. So the Tundra gets 89 or 91, and it’s always top tier Chevron.
     
  24. Dec 19, 2018 at 3:24 AM
    #24
    Lake.Life24

    Lake.Life24 New Member

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    Yeah you will probably see a 1-2 mpg bump
     
  25. Dec 19, 2018 at 5:17 AM
    #25
    Cement_Trd

    Cement_Trd New Member

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    Take this with a grain of salt or an unbiased opinion. I have always owned performance cars that required 93+ octane due to either forced induction or higher compression ratio. Whats note worthy is if a tuner has ran dyno charts on a stock tune engine with different variances in octane performance in timing, knock and A/F ratios I will take that advice over minimal requirements. (Elevation and climate does play a role) A few tanks of higher grade octane will make a difference in the performance of the engine and fuel mileage. Lower octane fuels have more impurities and have less refinement and additives. Note that the higher the octane of fuel the higher the combustion ratio and temperature at which it burns = less knock and wear on pistons, wrist pins, and bearings. If you have ever gotten a bad tank of fuel you can tell immediately how the truck is running. The biggest issue with running higher octane is cost. Is there benefits Yes but it comes at a slight cost increase.

    I would average your fillup cost and frequency on average 87 octane. Then factor in the increase to 93 octane or 91. If a few hundred dollars extra a year gives you more power and peace of mind then theres your answer
     
    Last edited: Dec 19, 2018
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  26. Dec 19, 2018 at 7:21 AM
    #26
    OBXTundra

    OBXTundra Member

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    X3 or 4....

    As others have said, it has been proven by 2 different tuners on here (when I say tuner I mean an actual person with knowledge, not a BullyDog) that the 5.7 retards timing on 87 Octane fuel. Less so on 89 and runs without modulation on 91 or above. This has nothing to do with fuel impurities, quality of fuel, refinement....it has everything to do with the properties of the fuel in regard to detonation prevention. This is factual, not based on MPG's, and can be replicated on a dyno. I was very interested in this a few months back because I inadvertently stumbled onto positive results while running 89.

    I brought this up a few months ago on a towing thread, I was scoffed at on there as well by the "run 87 or you're wasting your money" crowd. The difference in running 89 was most evident when towing. The truck down shifted less because it had more power at lower RPMS. The engine was not attempting to modulate the timing and therefore was happier running with a load at a lower RPM. The ECM was also not calling for the transmission to shift, also in an effort to mitigate detonation. It has been proven that the Tundra will both modulate timing and force shifts to mitigate detonation. I run 89 or higher for this reason alone, not MPG's, not because it's a cleaner or better fuel (which it's not), but simply because the engine PERFORMS better on it.

    When lower octane fuel is used, the engines first reaction is to modulate timing, the after thought it to increase RPM's quickly. Because detonation is less prone at increased RPM's. Running 89 or higher prevents the ECM from intervening, therefore holding a gear for longer, or running at a consistently lower RPM vs Load.

    And Quoted from D.A.P again; the guy that knows more about how the ECM and control logic functions on these trucks than anyone else.
    "As we have reported with every truck we have tested on, 4.6L, 4.7L, 5.7L, all run best on 91+ octane weather they are completely stock with stock tune, or tuned. These engines pull 8-12 degrees of timing due to knock retard on 87 oct, 6-10 deg on 89oct, 2-6 deg on 91oct, and 0-2deg on 93oct. That is on a completely stock truck with factory tune.

    If you care about the engine in your $35,000-$65,000 truck as you think you do, you wont run anything but premium in it weather you are tuned or not tuned."


    He should be considered the expert on this, yet members still dismiss it. Because "toyota engineers know better" or "premium fuel is a waste of money". Those opinions are just that, opinions with zero factual basis except "that's what the manual says".

    I wish someone would put the fuel grade debate to sleep, maybe Dirty Deeds and D.A.P should write a synopsis.
     
  27. Dec 19, 2018 at 7:36 AM
    #27
    Deuxlatch

    Deuxlatch AirBus

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    As a rule of thumb: Lowest octane (low grade) = Lawn equipment, Mid-grade = Everyday driver, Highest octane = High performance

    I run 93 octane Shell/Chevron/Exxon in my Supercharged tundra but I run mid-grade in the wife's 4Runner
     
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  28. Dec 19, 2018 at 8:54 AM
    #28
    Devcom

    Devcom Miles per Gallon? More like Smiles per Gallon!!

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    Did D.A.P test the Flex Fuel models and if so did they differ between the normal non flex fuel 5.7s? My question is due to the fact that I ran 91 for a while on my FF Tundy and noticed not much of a difference in shifting or power over 87 even while towing. Not trying to instigate just really want to know before I spend more money on 91 if it doesn't affect the Flex Fuel models like the reg Tundras.
     
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  29. Dec 20, 2018 at 9:55 PM
    #29
    tundras00

    tundras00 New Member

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    I have a flex fuel. I posted how my truck reacts in an earlier post in this very thread. Run at least a couple of tanks and see how your truck behaves. That's what made up my mind.
     
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  30. Dec 21, 2018 at 5:32 AM
    #30
    OBXTundra

    OBXTundra Member

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    I'm flex fuel as well.

    Daily driving didn't notice any difference. Maybe a few tenth higher MPG, but that could be attributed to anything.

    It was evident pulling my 8000lb trailer that the switch to even just 89 made a difference in the drivability and shifting. Also increased by more than 1 mpg towing, easily attributed to consistently running at a lower RPM. This was over multiple 800+ mile trips.
     

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