Tribeca test

Discussion in 'Subaru Tribeca' started by Pinehollow, Oct 28, 2005.

  1. Pinehollow

    Pinehollow Guest

    I have a Tribeca that I just took in for the 3000 mile oil change. I have
    been a little dissatisfied with the mileage that I get, so I watch the MPG
    display a lot while driving to see what kind of habits are the most
    desirable.

    While driving on the Florida Turnpike, I was holding about 70 MPH and noting
    that on the instantaneous MPG, I was getting 24 MPG, which I thought was a
    little low. I got behind another car going a little slower, about 68, and
    noticed that the MPG started indicating between 27-29 and hovered around 28
    while I stayed about 100 feet behind him. Decreasing the distance to about
    30 feet increased the MPG to about 30. I don't know what would happen if I
    got really close, but I assume the effect would have been dramatic.

    I experimented a little more and followed other vehicles that were holding
    70 MPH. I found that it didn't seem to make a difference what type of
    vehicle was in front of me. I drafted behind a large truck and a small car
    and the MPG variation was almost the same. Following one truck at 60 MPH
    gave in indication of 34 MPG. I didn't notice the MPG at 60 without
    drafting.

    There were a lot of other little things that I noticed, such as the effect
    of cars passing me while of was holding 70. There would be a decrease in
    MPG when the car was just behind me and the MPG would increase as the car
    passed, peaking while he was about a car length in front. Being in a
    different lane made the effect last a little shorter period.

    What I learned was that it pays to draft! With gas so expensive, if I
    draft, even at a safe difference, I can save quite a bit. Has anyone else
    experimented with this? I have had the instantaneous MPG display on other
    cars, but never really paid any attention to it before.

    Don
     
    Pinehollow, Oct 28, 2005
    #1
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  2. As you found, drafting can be done safely and can pay off. When I was an
    avid bicyclist, drafts were golden! Okay, I wasn't always safe with *that*
    but at highway speeds the draft can extend back a long way. The downside is
    that it takes very little sidewind to shift the draft completely off the
    road.

    Mike
     
    Michael Pardee, Oct 28, 2005
    #2
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  3. Pinehollow

    R Sweeney Guest

    think of the money you will save after you have killed yourself by
    tailgating
    (the other word for drafting)
     
    R Sweeney, Oct 29, 2005
    #3
  4. The two are not synonymous. I admit my drafting on a bicycle was following
    *way* too close, but at highway speeds there is sometimes useful draft at
    normal following distance. The trick is knowing how to recognize it. On a
    bike it feels like a warm, relatively quiet zone. In a car it is just a zone
    of soft buffeting, unless you can hear the drop in wind noise or see it on
    the instantaneous mpg display. If it isn't there, oh well.

    Mike
     
    Michael Pardee, Oct 29, 2005
    #4
  5. Pinehollow

    Pinehollow Guest

    I believe that you didn't read my entire post. I don't advocate unsafe
    situations. I mentioned that traveling 100 feet behind the vehicle in front
    provided about 4 MPG better mileage. 100 feet behind was safe and I believe
    that I will experiment further to see if it really pays off. Don't be so
    quick to criticize others when you really don't have the whole picture. It
    seems as if there is always someone who likes to appear to be holier than
    thou about almost any subject.

    Don
     
    Pinehollow, Oct 29, 2005
    #5
  6.  
    Carl 1 Lucky Texan, Oct 29, 2005
    #6
  7. Pinehollow

    l.lichtman Guest

    Carl 1 Lucky Texan wrote:
    At what speed does a vehicle cover 100ft in 2 seconds?
    ^^^^^^^^^^^^^^^^^^^^^
    34 MPH
     
    l.lichtman, Oct 29, 2005
    #7
  8. Pinehollow

    CompUser Guest

    Interesting...I've noticed an increase in
    tailgaters as well!

    Never thought to correlate it with the higher
    gas prices...

    Thanks, next guy that starts it up, I'll just be
    sure to change lanes on him, ha!
     
    CompUser, Oct 30, 2005
    #8
  9. No, you have to think further: the tailgater is trying to save gas.
    So help him/her out: you'll save more gas by going slower, so when
    you have a tailgater, you can assume they're trying to save gas. So
    take your foot off the gas, don't touch the brakes, and gradually slow
    down...that way, you're helping them.

    As well as pissing them off.
     
    Wandering Willy, Oct 31, 2005
    #9
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