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High Altitude and octane rating

Discussion in 'Technical Chat' started by Warren Thompson, Jul 28, 2009.

  1. Jul 28, 2009 at 10:35 AM
    #1
    Warren Thompson

    Warren Thompson [OP] GeoTaco

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    Warren
    Elko, Nevada
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    Okay, I have been through all the octane threads and believe the consenses is people like the higher octane rating better.

    But how about for a Taco 4.0 running at 5000-8000 feet in the mountains? Does a higher octane really get you more?? Does the computer adjust for higher altitude (less oxygen)? Could I get away with 85 octane in the higher altitudes??

    Anybody have a good scientific answer?? I sure do not!!
     
  2. Jul 30, 2009 at 11:38 AM
    #2
    ProtoJ

    ProtoJ Well-Known Member

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    Colorado
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    Removed 2nd air fliter, AFE Pro Dry filter, Scangauge II, shorty antenna, ARE CX Topper, URD Short Throw w/ TRD Shift Knob, Toyota Chrome Exhaust tip, FJ TRD Center Caps, Westin Prerunner bar w/ Hella 500 Lights, Hardwired Garmin
    I think the computer adjusts the air/fuel ratio automatically for altitude. I would just use mid-grade (87 here). I live at 6400 ft and the lowest elevation I go to is 4,400 ft, the highest is about 10,000 ft and I seem to get the same gas mileage at all elevations.
     
  3. Jul 30, 2009 at 4:40 PM
    #3
    Warren Thompson

    Warren Thompson [OP] GeoTaco

    Joined:
    Jul 19, 2009
    Member:
    #19861
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    263
    Gender:
    Male
    First Name:
    Warren
    Elko, Nevada
    Vehicle:
    '06 Tacoma DC TRD Sport RadRed
    Thanks, I will use the mid-grade here too. I have used 85 and the engine runs fine. No pinging or missing driving at 6000'+. But a better fuel is always good, especially when mixing it with less oxygen.
     
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