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Improving fuel economy?? Any hints?

Discussion in '1st Gen Tundras (2000-2006)' started by 03TundraWA, Feb 12, 2020.

  1. Feb 12, 2020 at 7:18 PM
    #1
    03TundraWA

    03TundraWA [OP] New Member

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    2003 Tundra 4.7 TRD 4x4
    OE wheels replaced with 16” TRD Off-road wheels
    Hi, has anyone figured out a way to improve gas mileage with their Tundra?
    I get about 13-15 mpg normally and only 10 mpg when towing.
    Absolutely love our Tundra and the only concern is poor fuel economy.
    Every Tundra/LC/Lexus Owner I’ve talked to says the same thing.
    Any help/advice/mods would be appreciated
     
    whodini12 likes this.
  2. Feb 12, 2020 at 8:30 PM
    #2
    Huvster

    Huvster New Member

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    You answered your own question. Everyone has poor economy. It's a heavy box on wheels. Do a complete tune up, take out extra weight, drive like a granny, spend thousands to gain a few mpg... my other truck is a 2018 silverado and I still only get 15 most of the time...
     
  3. Feb 12, 2020 at 8:48 PM
    #3
    empty_lord

    empty_lord They see me rollin'

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    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    13-15 mpg ? your doing great! my 05 Regular cab has been averaging 11-12 mpg for me, touchy gas pedal doesnt help. You want mpgs? headers, injectors and a good exhaust. If you baby it, you MIGHT get 2 mpg for THOUSANDS of dollars in parts


    or get a pedal commander and make it force you to drive like a grandma
     
    PRO BLANCO likes this.
  4. Feb 12, 2020 at 8:48 PM
    #4
    SouthPaw

    SouthPaw The headlight guy

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    Colorado
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    These things are pigs. I remote start my truck daily and last tank I got 10mpg. I think the best tank I ever got was 15mpg.
     
    empty_lord likes this.
  5. Feb 12, 2020 at 9:00 PM
    #5
    Skey44

    Skey44 GreenvilleOverland

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    Lift, tires, skids, sliders, fridge, camper
    Some folks buy a DD off Craigslist :monocle:
     
    ehtundra01, Ely010606 and empty_lord like this.
  6. Feb 12, 2020 at 9:05 PM
    #6
    1lowlife

    1lowlife Toxic prick..

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    THE GREAT STATE OF TEXAS
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    Get a Prius?

    These posts have me feeling pretty good about my 5.7 with 14 MPG, 90% of it city miles.
     
  7. Feb 12, 2020 at 9:48 PM
    #7
    newguy

    newguy New Member

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    SoCal
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    TRD Dual Exhaut TRD Pro wheels BFG KO2 275/70/18 GoRhino RB20s Blacked out tail lights Bilstein 6112/5160 combo Coach builder +1 in the rear
    I have my wife get out and push.
     
  8. Feb 12, 2020 at 9:51 PM
    #8
    Ely010606

    Ely010606 New Member

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    LMFAO!!!
     
  9. Feb 12, 2020 at 9:55 PM
    #9
    AzureNightmare

    AzureNightmare ASCM#1 Douchebag formerly known as 50 Buck

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    V8 Tundras are gas guzzlers. There is no changing that. You can do the hypermiler stuff, crazy expensive mods, and on and on, but don't ever expect much better than high teens. There will be some that chime in with super high numbers, and others with super low, but the simple fact is that you will NEVER get great mileage out of a gas V8 pickup without adding things like cylinder deactivation and the like. Love it for what it is, and if that's not enough to outweigh the mileage, you may want to get a commuter or a different rig.
     
  10. Feb 12, 2020 at 9:58 PM
    #10
    newguy

    newguy New Member

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    TRD Dual Exhaut TRD Pro wheels BFG KO2 275/70/18 GoRhino RB20s Blacked out tail lights Bilstein 6112/5160 combo Coach builder +1 in the rear
    I also only drive downhill.
     
  11. Feb 12, 2020 at 10:00 PM
    #11
    empty_lord

    empty_lord They see me rollin'

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    custom body work, Billies with taco ARB springs, Icon AAL, TRD FJ trail team wheels, 2019 Toyota 86 radio, Blacked out interior, Added factory power everything, heater mirrors, ETC
    Genius! I guess I should get married soon. With the tax incentives and better gas mileage I’d say it’s worth it!
     
    lsaami and Ely010606 like this.
  12. Feb 12, 2020 at 11:12 PM
    #12
    Aerindel

    Aerindel New Member

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    I got 15.6... once....all highway.

    But yeah....they suck gas. No fixing that.
     
  13. Feb 12, 2020 at 11:23 PM
    #13
    JLS in WA

    JLS in WA New Member

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    Somewhere in the basalt rocks with my dog
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    I drive a 2018 Chevy 1500 everyday. Even with the smaller V8 and multi cylinder deactivation I average 15.6 mpg.
     
  14. Feb 13, 2020 at 3:10 AM
    #14
    browntundra77

    browntundra77 New Member

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    I have been wondering if the mpg gets better or worse with flex fuel instead of 87
     
  15. Feb 13, 2020 at 3:19 AM
    #15
    AzureNightmare

    AzureNightmare ASCM#1 Douchebag formerly known as 50 Buck

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    In my time on here the only time I read about anyone getting better mileage off a fuel was using ethanol free.

    I have not tested to confirm this, and my truck is not flex fuel, so take it with a grain of salt. I just put fuel in it when between a half tank and 3/4ths, and I don't consistantly put ethanol free in.
     
    2manytoys likes this.
  16. Feb 13, 2020 at 3:31 AM
    #16
    remington351

    remington351 New Member

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    There's been a few threads about fuel economy that you can search for. As others have said, keep your engine tuned up and drive with a soft foot. Inflating tires to max pressure is probably the single most effective mod that you can do for mpg assuming your motor is in tune. Another guy posted that improving 1 mpg only nets you about $150 per year in savings.
     
  17. Feb 13, 2020 at 3:34 AM
    #17
    Ajkkane

    Ajkkane Old fart.

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    Exhaust Dirty Deeds 8”SS, some led lights, Osram headlights, Pro Stop brakes, Pop Lock, AFE dry air filter with charcoal delete.
    Tow it with a Prius
     
    joonbug and TundraDude18 like this.
  18. Feb 13, 2020 at 3:48 AM
    #18
    tvpierce

    tvpierce Formerly New Member

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    It will get worse with any amount of ethanol... and the more ethanol, the worse it will be.
    Reason being that ethanol has significantly less energy (BTU) than gasoline. It would take almost 1.5 gal of pure ethanol to produce the same amount of energy as 1 gallon of gasoline. You can't argue with the science.

    [​IMG]
     
  19. Feb 13, 2020 at 3:52 AM
    #19
    foxtrapper

    foxtrapper New Member

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    Here's two you can study on that were modified for hypermiling
    T100:
    https://ecomodder.com/forum/showthread.php/t100-question-6323.html
    https://www.toyotanation.com/threads/under-belly-pan.325836/

    He did a lot with that truck, getting it up just over 30 mpg on the highway as I recall.

    Tacoma:
    http://www.cleanmpg.com/community/index.php?threads/9845/


    Much dealt with the aerodynamic drag these trucks have. If you don't want to deal with it, which is understandable, you're more limited. But, there are things you can do to maximize what you've got.

    Tires: Low rolling resistance. This generically means high pressure and a narrow highway type tire.
    O2 sensors: This is what trims the engine, when the O2 sensor gets old and lazy, gas mileage drops.
    Brakes: Check them for drag. Lots of vehicles have mildly dragging brakes.
    Oil: Thinner oils have less parasitic drag. Engine, transfer case, differential, manual transmission.
    Alignment: Excessive toe in or toe out creates drag.
    Injectors: Dirty/worn injectors will spray poorly, resulting in lower efficiency.
    Ignition: Weak spark causes delayed combustion, reducing efficiency.
    Speed: Ek = ½mv2 Lots more energy needed to drive 70 than 60.
     
    Ncreator74 and AzureNightmare like this.
  20. Feb 13, 2020 at 3:58 AM
    #20
    BubbaW

    BubbaW Saw it right off

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    "Improving fuel economy?? Any hints?"....accept the fact that 1st Gens are black holes We throw money into and enjoy the hell out of it.

    Good suggestions have been given, so head on over and join in on the fun at the Official Gas Mileage Thread
     
  21. Feb 13, 2020 at 4:21 AM
    #21
    Bad Cow

    Bad Cow GOD Bless The USA

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    I keep seeing where guys say they get better fuel mileage with a Tonneau Cover. Then I read this at Consumer Reports.

    "This test was performed using a 2013 Dodge Ram V8.
    We found that adding a tonneau cover or lowering the tailgate hurt fuel economy, rather than helped it.

    With the tailgate up and no tonneau, we got 22.3 mpg. Dropping the tailgate decreased efficiency to 21.5 mpg. That 4-percent difference means that driving the Ram all year exclusively on the highway could cost the owner an extra 20 gallons of gasoline. (In reality, this big workhorse is likely to see a mix of driving and a variety of chores, limiting the potential penalty.)

    We found that covering the bed with a soft tonneau cover was even more detrimental, dropping fuel economy to 21.4 mpg.

    Given that even the latest pickup trucks have an insatiable appetite for gasoline, it is natural that owners will want to maximize their fuel economy. Unfortunately, these tricks proved to be ineffective."
     
    Joss1799 likes this.
  22. Feb 13, 2020 at 4:28 AM
    #22
    AzureNightmare

    AzureNightmare ASCM#1 Douchebag formerly known as 50 Buck

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    Correct. It's super simple, but the Mythbusters (I know, not the most shining example of science) did practical test on this. They also simulated an air tunnel with a toy truck in water. Essentially, a truck bed builds one big vortex that directs air over the bed once you are up to speed.

    Here's a pic of an actual wind tunnel with the gate up, and down.
    [​IMG]
     
  23. Feb 13, 2020 at 4:30 AM
    #23
    zombie

    zombie Master at Something

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    My other vehicle is a Moped.:thumbsup:
     
    revtune likes this.
  24. Feb 13, 2020 at 4:31 AM
    #24
    browntundra77

    browntundra77 New Member

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    Big variable here would be speed though. At highway speed the principal is clearly indicated here, but with a lot of city driving I would think that example is nullified.
     
  25. Feb 13, 2020 at 4:36 AM
    #25
    AzureNightmare

    AzureNightmare ASCM#1 Douchebag formerly known as 50 Buck

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    Not certain that is entirely true. It might be a slower, lazier vortex at 20 MPH than at 65, but it would still be there. At low speed drag would play less of a factor on your mileage, so the reduced effect of the weaker vortex should balance. Wouldn't it? I really don't know. Just kinda logic-ing it out, and I'm stupid tired right now.
     
  26. Feb 13, 2020 at 4:36 AM
    #26
    10TundraSR5

    10TundraSR5 Happy Tundra owner

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    Not nearly as much as most people on this site but some.
    The tax incentive is a lie! Do not fall for that or the soul crushing trap known as marriage. Just enjoy having a great truck and buy mods for it. You have been warned....
     
    empty_lord likes this.
  27. Feb 13, 2020 at 4:48 AM
    #27
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Check out the ‘Official MPG’ thread and you’ll see your results are inline.

    Doing a rough guesstimate here:

    All city I usually get around 11-13 MPG (spirited driving with some idling in winter)

    If I do a full highway tank I get 17-18mpg (avg. 70mph speed)

    285/75/r16 tires
     
  28. Feb 13, 2020 at 4:49 AM
    #28
    0.S.T.

    0.S.T. New Member

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    Easy on the right foot, Don't race stop light to stop light, cruise control.
    And believe it or not, Bas Ass Muffler helped out a bit on mileage. Once I got my right foot off it.
    ….But it sounds so damn good! lol.


    O.S.T.
     
  29. Feb 13, 2020 at 4:51 AM
    #29
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    Soft tonneau covers tend to flutter at speed, so I can see why they would be detrimental.
    Did they or anyone compare soft covers with hard covers?
     
  30. Feb 13, 2020 at 4:56 AM
    #30
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    The highest MPGs that I have seen from either of my trucks was when I was driving smooth & steady and never touching the brakes or exceeding 60 MPH for extended periods, it's almost impossible to drive this way - and it's boring.
     

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