1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Help MPG thoughts talk Please!

Discussion in '2nd Gen. Tacomas (2005-2015)' started by GeorgeW, Jun 14, 2012.

  1. Jun 14, 2012 at 6:53 AM
    #1
    GeorgeW

    GeorgeW [OP] Member

    Joined:
    Jun 14, 2012
    Member:
    #80644
    Messages:
    16
    Gender:
    Male
    First Name:
    George
    New Hampshire
    Vehicle:
    2012 Tacoma reg. cab 4X4 2.7 5speed St. shift
    Stock but did install a ARE cap with roof rack. fold up windows all the way around for ease of use .
    Hello,
    I'm new here! my wife and I picked up a 2012 tacoma rag.cab 4X4.We have about 2000 miles on it we do mostly drive highway 55 we have the 5 speed st. shift tranny. worst tank was 20.4 best tank was 27.5 most of the time we got 24.5 to 25.5.. Happy with that.. But we installed a ARE Cap not the lowest one but then the tallest one.. it's about 4" taller the the cab but well desined in that there is a good strong slant to the trans-isun.. Sorry.. But found that the MPG droped to a good stady 22.4 MPG now on most all tanks.. The cap onlu weights 140lbs it does have a roof rack systom but there only small 1 1/4" round bars.. ( They can come off) I would have thought that the cap should have inproved MPG just a tad.. I'm trying to use 5th (over drive) when I'm free going and if I have to give it some gas to make a hill I try and gain 10mph or so before hitting the hill od down shift if responce is low when I get on the gas.. I try to drive not to stress the motor and bog it down by being in the wrong gear. Please you thoughts on my MPG? I really would like to see 25mpg on most fill ups.. That would make me happy.. Thanks George
     
  2. Jun 14, 2012 at 7:07 AM
    #2
    DueNorth

    DueNorth Well-Known Member

    Joined:
    Mar 19, 2009
    Member:
    #14934
    Messages:
    1,832
    Gender:
    Male
    First Name:
    Mike
    Southern Ontario, Canada
    Vehicle:
    2014 BSP TRD Sport DCSB 6sp
    Slightly tough read but here's my thoughts. The cap plus rack adds an extra 140+ lbs so obviously your dragging around more weight which means you'll burn through more fuel. Despite your thinking that it aids in aerodynamics it doesn't really translate to saving fuel though.

    You're only a couple mpg off where you'd like to be so if it means that much to you, take the topper off when not in use? Else you may just have to live with it. :notsure:

    Above all, your driving a truck not a Prius ;) so good gas mileage is hard to come by.
     
  3. Jun 14, 2012 at 7:13 AM
    #3
    05RedTaco

    05RedTaco Nom Nom Nom

    Joined:
    Sep 20, 2010
    Member:
    #43521
    Messages:
    1,686
    Gender:
    Male
    First Name:
    Tony
    Scottsdale
    Vehicle:
    2000 Tacoma XtraCab 2.7L 4x4
    Shut yer trap, I get 11mpg so your whining about getting 22.5mpg aggravates me.

    If you wanted better mpg you should have bought prius.
     
  4. Jun 14, 2012 at 7:16 AM
    #4
    Toy Yoda

    Toy Yoda gotta make sure Youtube comes down to tape this

    Joined:
    Apr 12, 2011
    Member:
    #54800
    Messages:
    1,867
    Gender:
    Male
    First Name:
    Garrett
    Vehicle:
    06 DCLB
    OME, ARB, Warn, Snugtop XV
    if you want the bed covered just get a tonneau cover, light weight and will help with aerodynamics, or just fold the tailgate down...
     
  5. Jun 14, 2012 at 7:16 AM
    #5
    cgs2k2

    cgs2k2 Ohio Member

    Joined:
    Apr 24, 2010
    Member:
    #35923
    Messages:
    2,607
    Gender:
    Male
    Well he wanted a truck, so he didn't buy a prius. Just because you get bad MPG for things you've done to your truck/how you drive, doesnt mean somebody else can't be dissatisfied with their MPG.

    OP: Take the bars off, that should help a little. You'd be surprised.
     
  6. Jun 14, 2012 at 7:31 AM
    #6
    DueNorth

    DueNorth Well-Known Member

    Joined:
    Mar 19, 2009
    Member:
    #14934
    Messages:
    1,832
    Gender:
    Male
    First Name:
    Mike
    Southern Ontario, Canada
    Vehicle:
    2014 BSP TRD Sport DCSB 6sp
    Didn't mythbusters bust that theory?
     
  7. Jun 14, 2012 at 7:39 AM
    #7
    Simon's Mom

    Simon's Mom Wag More Bark Less

    Joined:
    Apr 12, 2007
    Member:
    #1297
    Messages:
    9,828
    Gender:
    Female
    First Name:
    Judy or Jude :)
    NEK Island Pond VT
    Vehicle:
    13 TRD OR DC MGM
    Stock for now
    Its the topper w/ rack.
    My tacoma had a thule rack/no topper & lost mpg.
    Your mileage sounds excellent though.
    Mine never saw 20 ever. (V6/4x4/DC)
     
  8. Jun 14, 2012 at 7:50 AM
    #8
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    34,549
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '18 Ford F-250 SCREW
    F-250 Land Yacht Mod
    They did and tailgate down is worse for MPG's.

    x2. The rack might be hurting you more than you think. I've got a topper with a 3" rise over the cab and I get 20 MPG with a V6 double cab (a little better than I was getting with just a tonneau).
     
  9. Jun 14, 2012 at 7:56 AM
    #9
    BrokenTusk

    BrokenTusk I support a velociraptor free workplace.

    Joined:
    May 5, 2010
    Member:
    #36607
    Messages:
    31,958
    Gender:
    Male
    First Name:
    Marcelasaurus
    AB, Canada
    Vehicle:
    The Scarlett Whore
    Check Build Thread!!
    If your goal is purely MPG's and your not worried about cost, you can get lightweight engine pulleys. The NST brand is top rated.
     
  10. Jun 14, 2012 at 8:06 AM
    #10
    lj973gm

    lj973gm Sold it, dont miss it yet.

    Joined:
    Sep 16, 2011
    Member:
    #63618
    Messages:
    852
    Gender:
    Male
    Ohio
    Vehicle:
    06 DCSB 4wd
    As someone mentioned it is more than likely the rack. They are known to really disrupt the airflow since it have to go over and under.

    When I ride in my work van I can see my mpg drop when ladders are on there, they weigh very little but are horrible for airflow.

    Not sure what rack you have or if you use it all the time but try taking that off and track mpg to see if it is the cap or the rack.
     
  11. Jun 14, 2012 at 8:11 AM
    #11
    BrokenTusk

    BrokenTusk I support a velociraptor free workplace.

    Joined:
    May 5, 2010
    Member:
    #36607
    Messages:
    31,958
    Gender:
    Male
    First Name:
    Marcelasaurus
    AB, Canada
    Vehicle:
    The Scarlett Whore
    Check Build Thread!!
    Most people are seeing a 1 mpg difference :cool:
     
  12. Jun 14, 2012 at 8:13 AM
    #12
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    34,549
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '18 Ford F-250 SCREW
    F-250 Land Yacht Mod
    What about the lighter flywheel, that would probably be just as, if not more effective.

    Are there issues with engine balancing though? I read that some vehicles don't do well with lighter pullies.

    Also, 1 MPG gain and a cost upwards of $300, the payoff is about the life of the truck.
     
  13. Jun 14, 2012 at 11:04 AM
    #13
    knucklehead

    knucklehead Well-Known Member

    Joined:
    May 1, 2012
    Member:
    #77990
    Messages:
    273
    Gender:
    Male
    First Name:
    Jeff
    Ottawa
    Vehicle:
    SR5 4x4
    Hitch, nav header
    It isnt the weight. You could add 1000 pounds of lead bricks and its effect would be negligible. same with light weight pulleys and flywheels -- those would let you wind the engine up quicker, but wouldnt affect fuel consumption.

    This matter is 100% aerodynamics. You have increased the frontal surface area, and the aerodynamic profile. The big flat wall you now have for a back end is creating a massive zone of vacuum that you are pulling around.

    Removing the roof racks will help, but if you want to make it good, you will have to ditch the lid.
     
  14. Jun 14, 2012 at 11:11 AM
    #14
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    34,549
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '18 Ford F-250 SCREW
    F-250 Land Yacht Mod
    Where do you get your information from?? Put 1,000 lbs in the bed and I promise you the MPG's will go in the shitter. I get what you're saying but your delivery needs some work. Also, for the 4 banger, the added weight would have more of an impact vs. the V6.

    If the engine is equipped with lighter pullies and a light flywheel, it will let it spin up quicker but will also increase MPG's because you have less mass to get spinning and keep spinning within the engine. This means the engine isn't working as hard to produce the same amount of power to the wheels, which means less fuel consumption. It won't be a huge difference but lightweight pullies and flywheels do affect MPGs...
     
  15. Jun 14, 2012 at 11:21 AM
    #15
    Enzo

    Enzo Well-Known Member

    Joined:
    Sep 6, 2010
    Member:
    #42815
    Messages:
    1,372
    Gender:
    Male
    First Name:
    Opie
    Bedford, Va
    Vehicle:
    2012 FJ Cruiser
    2012 FJ Cruiser Maggiolina Medium Grand Tour w/winter hood National Luna dual battery split charging system ABR Sidewinder Aux battery tray ARB 50qt Fridge w/Transit Bag Bajarack flat rack w/ladder Crawlarado flat black hood blackout TRD exhaust Trasharoo Outback FJ roof console
    Tailgate down does not improve mileage.
     
  16. Jun 14, 2012 at 11:58 AM
    #16
    knucklehead

    knucklehead Well-Known Member

    Joined:
    May 1, 2012
    Member:
    #77990
    Messages:
    273
    Gender:
    Male
    First Name:
    Jeff
    Ottawa
    Vehicle:
    SR5 4x4
    Hitch, nav header
    Guess you're no fan of Sir Isaac Newton, eh? First law says that you will keep moving in the same direction forever unless affected by a force... i.e. aerodynamic friction. I guarantee that a weight increase will not increase wind resistance in and of itself. It cant have an effect on fuel consumption except during acceleration. OP says highway driving constant 55 mph.
     
  17. Jun 14, 2012 at 12:05 PM
    #17
    knucklehead

    knucklehead Well-Known Member

    Joined:
    May 1, 2012
    Member:
    #77990
    Messages:
    273
    Gender:
    Male
    First Name:
    Jeff
    Ottawa
    Vehicle:
    SR5 4x4
    Hitch, nav header
    According to... mythbusters, who are unparalleled HACKS. I saw that episode, and their experimental controls were absolutely inadequate. There was far too much reliance on "foot on gas", and an assumption that a Ferd will have a constant and predictable fuel consumption.

    Not saying that their results were wrong, but that they didn't come anywhere near to actually proving it.
     
  18. Jun 14, 2012 at 12:20 PM
    #18
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    34,549
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '18 Ford F-250 SCREW
    F-250 Land Yacht Mod
    Holy hell, you really want to try and argue that one?!?! Newton's law of 'An object set in motion will stay in motion' only applys where there are NO outside forces. In the physical world we live in, you not only have wind resistence, but you have gravity, which you seemed to have conveniently forgotten about... More weight in the vehicle means more friction on moving parts, you'll squat your tires making more friction between the tires and the ground, more friction means more heat which makes things less efficient, etc. etc. all of which take more power to overcome. You WILL burn more fuel maintaining speed with a higher load, end of story.

    Don't argue Newton's laws with an engineer... :cool:
     
  19. Jun 14, 2012 at 12:32 PM
    #19
    BTO

    BTO Well-Known Member

    Joined:
    Nov 12, 2009
    Member:
    #25836
    Messages:
    420
    Gender:
    Male
    California
    Vehicle:
    '07 Silver PR DC AT SR5 TP LSD
    Defroster mod, Bilstein 5100s front, Adjustable Ranchos rear.
    Extra 140 pounds. Roof rack imparts additional air drag. The cap may too. Aerodynamics on pickups is a tricky science. What you might think will help actually hurts. Case in point, the mythbusters thing.
     
  20. Jun 14, 2012 at 12:32 PM
    #20
    knucklehead

    knucklehead Well-Known Member

    Joined:
    May 1, 2012
    Member:
    #77990
    Messages:
    273
    Gender:
    Male
    First Name:
    Jeff
    Ottawa
    Vehicle:
    SR5 4x4
    Hitch, nav header
    I suggest that you would be wise to heed your own advice. Newton's first law most certainly does apply. 2nd law, gravity does not apply since it is perpendicular to the motion. You want to start measuring how much extra friction there is against the bearings? Not even worth consideration.
     

Products Discussed in

To Top