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Does a fiberglass whaletail work?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Darwood, Feb 24, 2012.

  1. Feb 24, 2012 #1
    Darwood

    Darwood Bobtail Member

    11
    0
    Dec 7, 2010
    WISCONSIN
    0
    I have a 379exhd with a 70inch stand-up. I pull a stepdeck with a roll tarp. I have had the tail on my older E models and the tail worked great. But with my MXS acert, the fuel mileage constantly fluxuates from 5.1 to 5.8. I run the same roads and pull the same loads every week. I go out loaded and come home empty. I'm wondering
    if anybody has seen the ups and downs from an acert and if a tail would help.
     
    Darwood, Feb 24, 2012
    Darwood, Feb 24, 2012
    #1
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  3. Feb 24, 2012 #2
    Oscar the KW

    Oscar the KW Going Tarpless

    12,246
    28,114
    May 19, 2011
    0
    I had one on my w9 when I bought it. I left it up there for years until it started to leak. Pulled it off, filled the holes and repainted. I GAINED 2/10 by getting rid of the dumb looking thing.
     
    Oscar the KW, Feb 24, 2012
    Oscar the KW, Feb 24, 2012
    #2
  4. Feb 24, 2012 #3
    Krooser

    Krooser Road Train Member

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    Jul 25, 2010
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    I'd say they are right up there with Turbo 3000D's... and Motor Kote... and Air Tabs... and Tornado air intake vortex generators...
     
    Krooser, Feb 24, 2012
    Krooser, Feb 24, 2012
    #3
  5. Feb 25, 2012 #4
    Starline

    Starline Medium Load Member

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    Jun 1, 2011
    Middle Tn
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    I'd say the quality of fuel will make a better difference (summer blend vs winter blend) also try slowing down to 60-63
     
    Starline, Feb 25, 2012
    Starline, Feb 25, 2012
    #4
  7. Mar 25, 2012 #5
    2bit

    2bit Light Load Member

    178
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    Mar 13, 2012
    Medford,WI
    0
    Whale tails seem to disrupt air more than help. Put a Taylor wing on my W9, picked up .5 mpg. Not a guess I record every tank of fuel. Lower it till ya get bugs on the trailer then raise it one hole. Full fairing probably better but expensive and need to paint to match.
     
    2bit, Mar 25, 2012
    2bit, Mar 25, 2012
    #5
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