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Mythbusters 6/12/2013 - Hypermiling and Crash Cushion

Discussion in 'Now Playing - TV Show Talk' started by GoPackGo, Jun 13, 2013.

  1. LoadStar

    LoadStar LOAD"*",8,1

    Jul 24, 2001
    Milwaukee, WI
    Right company, I think, but wrong model. I'm pretty sure they're using the "Muscled Full Body" Anatomy Model from that company, which retails for $13k... and I'd bet they're getting a (much) better deal than retail pricing.
  2. cwerdna

    cwerdna Proud Tivolutionary

    Feb 22, 2001
    SF Bay Area, CA
    I'm not so sure about that. They've achieved records at Hybridfest (I don't have the links handy) and records like http://www.cleanmpg.com/forums/showthread.php?t=2783 (2,254.4 miles on 13.72 gallons = 164.315 mpg on a Gen 1 Insight).

    Also see my links in post 27.

    A Priuschatter did this graph: http://priuschat.com/threads/updated-mpg-vs-mph-chart.64296/. I found http://www.cnn.com/video/standard.html#/video/international/2008/01/13/lustout.hack.hybrid.cnn (from http://priuschat.com/threads/lifetime-mileage-report-by-japanese-hypermiler.73638/#post-1363174) on Japanese hypermilers. That video on the shogun is a bit misleading, his Prius wasn't a plug-in (to charge the battery). It was for the engine block heater: to cut or eliminate warm up time, which is a period of high fuel consumption.

    I was going to post a video I found on Wayne Gerdes on CNN, but apparently Waldorf in post 40 beat me to it. I hadn't seen it before until today.

    BTW, personally, I think the hypermiling behavior of folks like Wayne and the shogun are extreme and not something I'd recommend. There are a few things one can do that bother nobody and are simple (e.g. face out parking, FASing into a parking spot, combining trips, going to the furthest destination first, keeping your speed down a bit, etc.)

    But, it does irk me to see some of the bad driving people have talked about (e.g. accelerating/racing to red lights). I've also seen people idling their cars for an extended period of time for no apparent reason in parking lots (not cold, not hot out).

    I've also seen enormous lines (dozen+ cars long) at certain fast food places like In-N-Out and almost none of them are hybrids, PHEVs, EVs nor any car w/auto stop/start systems. Some of them are BRoD class SUVs. Hope none of those folks are complaining of high gas prices or poor gas miles. :rolleyes:

    RonDawg summed up people's unwillingness to change their own driving behaviors even during "high" gas prices pretty well at http://www.tivocommunity.com/tivo-vb/showthread.php?p=9625954#post9625954.
  3. RonDawg

    RonDawg Well-Known Member

    Jan 12, 2006
    I experienced a couple of examples of such behavior tonight. First, as I'm driving down a local 65 MPH posted freeway at, shocker, 65 MPH :) I noticed a Honda Civic tailgating me. Never mind there were three open lanes to my left, she insisted on following too closely.

    Rather than do a "brake check" that is so tempting, but so dangerous, I do the recommended thing and simply let my speed scrub off naturally. I put the car in "Eco" mode and let off the accelerator, and let the car's regen naturally slow the car to about 55 MPH. She finally got the point and went around me, at which time I found out her particular Civic was a hybrid model. Why buy the slower model that supposedly gets better mileage if you're going to rocket around me at 80 MPH :rolleyes:

    And no, she didn't need to exit at the next ramp, so nobody was "holding her up." It's her failure to drive with her head out of her anus and either maintain a safe following distance, or use the other three lanes to pass me. G-d forbid I actually obey the speed limit.

    Second one is the same posted 40 MPH boulevard on which my stated driving style seems to have gotten a rather strong reaction earlier. Traffic is going about 45 MPH, and yes I am slowing like I mentioned earlier. But frankly, so is everybody else due to the amount of traffic. That still didn't stop some kid (no older than 21 from what I can tell, so likely parents bought the car for him) in a new Toyobaru driving like a jackazz and passing everybody. Or trying to anyway, because the traffic signal gods were not in his favor. And guess who often ended up in the lane next to him, or right behind him, at EVERY single traffic light for several miles :)
  4. pteronaut

    pteronaut Killer of Threads

    Dec 26, 2009
    Could it be that the first a-hat was (in her mind) trying to take advantage of the spoiled air behind you to reduce her vehicle's fuel consumption? (Not that it excuses the tailgating)
  5. eddyj

    eddyj SeƱor Member TCF Club

    Jun 20, 2002
    South Florida
    That was one of the techniques they did not use, along with rolling stops.
  6. Flop

    Flop Member

    Dec 2, 2005
    They tested drafting on a previous episode I believe and determined you have to be extremely close (like 2 or 3 feet close) behind the other vehicle for it to be effective. It's been a while since I saw that episode, but I remember them having to put markers on the windshield of the test car and on the back of the lead vehicle for the test driver to line up in order to maintain distance since it was so close.
  7. RonDawg

    RonDawg Well-Known Member

    Jan 12, 2006
    Yeah, in that epsiode Grant was a couple of feet from the back bumper of that semi. He later said it was absolutely nerve-wracking.
  8. pteronaut

    pteronaut Killer of Threads

    Dec 26, 2009
    I believe that they did see some improvement even before they got that close in that episode. Although I'd doubt that drafting a car would be effective until you got as close as NASCAR racers do.
  9. MarkofT

    MarkofT ****

    Jul 27, 2001
    The Tall City
    I generally cruised around at or a bit above the 80 MPH speed limit in my 1st gen Insight. From my experience with that one specific hybrid, they are sportier then people think because they get obsessed with maximizing their MPG as opposed to driving. Even with the way I drove it, I still averaged 40 MPG.

    In the drafting episode, they saw improvements at all distances with staggering improvements at distances closer then most people feel comfortable parking.

    And I can vouch that you get a decent MPG bump with just about any drafting. But you are not drafting until you can feel your vehicle entering the turbulent wake behind another vehicle. In my F250, if I can get behind a semi, I'll see a 15% - 20% increase in MPG. In the BMW 323i we had, it would get a much bigger boost behind a semi at 80 MPH due to the relative size of the holes needed by each vehicle.

    To get into the draft behind a Leaf at 60 MPH, you would have to get quite close indeed due to the small hole in the air it makes plus the extra aerodynamics they put into smoothing the overall airflow that results in a much smaller draft. I doubt anyone other then a bicyclist would see any benefit at all from trying.
  10. Dirk Legume

    Dirk Legume Well-Known Member

    Nov 29, 2004
    Nor Cal
    I have a Sonata hybrid which I believe is rated at 38 by the EPA. Just by doing the things that RonDawg mentioned, I get much better than that. My last tank was 43 MPG and that included a trip, during which I had to drive 70 MPH for about 60 miles. It isn't hard to do and after a while, it just becomes second nature.
  11. chocophile

    chocophile New Member

    Dec 26, 2007
    RD is correct. Datalogging has been used to show that modern computer controlled, fuel injected engines use no fuel whatsoever when coasting in gear. Coasting in neutral with the engine running DOES use (some) fuel.

    Keep the engine running folks, so that your power brakes and power steering work if/when needed!

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