89 octane placebo...

Discussion in '2016 + Toyota Tacoma' started by DML347, Dec 15, 2018.

  1. DML347

    DML347 Member

    I bought a used 2017 ToyTaco Sport AC MT about a month ago . First Toyota of any kind. I've a basic understanding of how octane is used in engines that require it. Manual says to use 87 or higher. After trying 89 I am convinced the engine runs a bit better. This is my third tank of the 89 . While I will continue using the 89 I wonder if anyone else has experienced the same?. Is this a matter of 87 is good enough but 89 is best, perhaps 91 is even better?.. or have I somehow fooled myself ?.
    B-Man, texasred and OR17TRD like this.
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  3. OR17TRD

    OR17TRD Well-Known Member

    You do you how you feel like you need to. :)
    Crawdad, B-Man and texasred like this.
  4. whippersnapper02

    whippersnapper02 Negative Nancy

    Depending on your state, the higher octane fuel may have less ethanol. Less ethanol will create more power.
    Crawdad and texasred like this.
  5. Joisey

    Joisey Well-Known Member

    I bought my truck new in 7/18. V6 TRD off road, automatic. After about 1500 miles my transmission settled in. Every 2 weeks I travel the same route to grocery shop and shop in general. Same stores, the same day of the week (most times anyway). Fill up at the same Conoco station.

    The route coming home is a series of hills. After 5 months of traveling those hills in this truck while using cruise control, I know which hills rate 5th gear and which hills rate 4th gear to top, and about how long the truck takes to upshift.

    So having some extra cash in my pocket, and my truck reading low fuel, I filled up with Conoco premium (93 octane, up to 10% corn pee content). The fill-up is in the very beginning of the shopping route. The truck now had 3800 miles or a bit more on the clock.

    On the way home, I was surprised to find that the truck either downshifted less (meaning a downshift to 5th instead of 4th, or no downshift at all on lower hills) than when I used regular fuel from the same station. The truck also upshifted sooner after the downshifts. Since I get 3 weeks out of a tank of fuel (exciting life here), I got to repeat the test three more times, with the same result.

    Same people in the truck. Same grocery load plus or minus a bag. Temp within 15 degrees, no snow or rain on the roads. Used cruise control all the time on the route home. The only difference was the fuel.

    My train of thought, whether correct or not, is this. The engine has a high compression ratio (almost 12:1). It also has a knock sensor or sensors, which tell the computer to retard the timing in the event of spark detonation. Even with the direct injection giving a more thorough fuel-air mix in the combustion chambers, I feel that the computer is calling for a lesser degree of spark retard due to less sensing of detonation. This would possibly account for the decreased amount and duration of downshifting to top the hills.

    When that tank ran low, I refilled with regular gas with the 10% corn pee content and the downshifts went back to the way they were before the test. Increased fuel mileage?? Possible. Any time the spark is retarded, mileage suffers. Worth the extra money? Probably not. Just passing an observation along.
    Atomic Diesel, DML347, Bogunn and 3 others like this.
  6. jdr3366

    jdr3366 Well-Known Member

    I don't think it's the octane. No, no, it's the percent nitrogen in the corn pee, which can vary between fill-ups, altitude, and the time of year.

    Yes, I'm quite sure of it. In fact, James Bond had a knob on the dashboard that added cow pee to the engine at critical times.

    Corn pee is scientifically documented to have beneficial effects on several engine parameters as listed here.

    More pep it its step

    More pop at the top

    More zip in its chip

    More guts in its struts

    More clip at the tip

    More zing in its swing

    And, of course, as everyone knows...

    More zap in the flap

    I'll post a link later.
    OR17TRD, Bogunn, B-RI and 3 others like this.
  7. Joisey

    Joisey Well-Known Member

    You forgot to mention that the angle of the dangle is equal to the heat of the meat, providing that the mass of the ass does not vary.
  8. texasred

    texasred Well-Known Member

    On switching back from 93 to 89 octane...will it recalibrate for the lower octane itself or will I (yet again) have to reset/relearn driving style?
    B-Man and OR17TRD like this.
  9. OR17TRD

    OR17TRD Well-Known Member

    Just drive it. It’s tuned for 89.
    BigMau, B-Man and texasred like this.

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