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Fuel mileage dropped by 10-15% recently. 2007 5.7L 300k

Discussion in 'General Tundra Discussion' started by Claw, Nov 13, 2018.

  1. Nov 13, 2018 at 4:13 PM
    #1
    Claw

    Claw [OP] New Member

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    I have a 2007 5.7L Tundra TRD with 300k, no mods. Spark plugs were replace 25k ago, the throttle body was cleaned/serviced 5k ago. The reason for the background is that my fuel mileage dropped by 10-15% about 10k ago. No engine light alerts and nothing from the dealer after servicing even though I told them about the reduced fuel economy.
    Thoughts?
     
  2. Nov 13, 2018 at 4:22 PM
    #2
    Blueknights75

    Blueknights75 WHITE is the FASTEST color!!!!!

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    Welcome from NC! Show us some pics of this Tundra you speak of. Have you checked your O2 sensors? There are many variables that could be contributing to this...
     
  3. Nov 13, 2018 at 4:25 PM
    #3
    14burrito

    14burrito IG @14burrito

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    Are you up to date on all other services?
    Diffs, air filter, cabin filter, etc

    Did you happen to get new tires installed 10k ago?

    Have you verified tires pressures are the usual?
     
  4. Nov 13, 2018 at 4:43 PM
    #4
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    Flux capacitor for sure.
     
  5. Nov 13, 2018 at 4:55 PM
    #5
    stuckinohio

    stuckinohio MGM Crue

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    Did your area switch to winter gas? doesn't explain the change 10K miles ago but winter gas doesn't help fuel mileage.
     
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  6. Nov 15, 2018 at 6:56 PM
    #6
    Claw

    Claw [OP] New Member

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    Truck is well maintained, tire pressure is checked regularly. K&N air filter cleaned twice/yr. The mileage changed in the summer and has not happened before, using same gas station(s). The O2 sensors were my first thought, plugged cats my second, and I asked the dealer, standard reply "no engine light" means they are ok and they did not trigger anything when hooked up to the diagnostic unit. But, they have never been changed....300K (180,000 mi). I like long lasting parts but this might be a little much

    Toyota Tundra 2007.jpg
     
  7. Nov 15, 2018 at 6:58 PM
    #7
    Claw

    Claw [OP] New Member

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    Yes it's lowered, had to get into the park-aid at work......
     
  8. Nov 15, 2018 at 8:27 PM
    #8
    SR5 AZUL

    SR5 AZUL TRD

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    WELCOME
     
  9. Nov 15, 2018 at 8:38 PM
    #9
    AndyCBR

    AndyCBR New Member

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    Kind of a tough one. That's not a trivial amount of miles for O2 sensors and for what they cost that would be my next try.

    Cats are pretty expensive but you may be able to score some takeoffs from a forum member if you post up in the WTB section.

    Other thoughts:

    Transmission fluid changes? Dealers love to say lifetime but no fluid lasts forever.
    Any noisy wheel bearings?
    On Fords most people change all eight COP's as a matter of course at this mileage and claim drivability gains but not necessarily mileage gains.
    Dragging calipers? Sometimes they are slight without overheating/locking up.

    Hope this helps.
     
  10. Nov 15, 2018 at 11:55 PM
    #10
    s1000rr

    s1000rr New Member

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    Trade you front bumpers for a chrome one though ;)
     
  11. Nov 16, 2018 at 12:47 AM
    #11
    YTThao530

    YTThao530 New Member

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    New Air filter..not just cleaned your old K&N.
     
  12. Nov 16, 2018 at 4:32 AM
    #12
    vanoss101

    vanoss101 New Member

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    The two biggest reasons for significant reduction is fuel mileage is dragging brake calipers (check if any of your wheels are warm after a long drive) and taking more short trips. That big V8 uses a lot more fuel while warming up.
     
  13. Nov 16, 2018 at 3:00 PM
    #13
    Claw

    Claw [OP] New Member

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    Thanks, I will try a factory air filter and will check all wheel - brakes for free rotation w/o brake drag. Please continue with the Flux capacitor suspicions, didn't know my truck was capable of flight or time travel!
     
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  14. Nov 16, 2018 at 3:08 PM
    #14
    Fishman57

    Fishman57 New Member

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    Looks great lowered.
     
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  15. Nov 16, 2018 at 3:18 PM
    #15
    tundras00

    tundras00 New Member

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    Since you have a K&N filter, have you cleaned your MAF lately?
     
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  16. Nov 16, 2018 at 3:20 PM
    #16
    Rob371

    Rob371 New Member

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    Steel bumpers front and rear,1.4" bilstien, KatSkinz Leather, rear airbags, halos.
    KnN has better air flow. Switching back isn't going to help. Factory or aftermarket are restricting airflow. KnN cleaned and oiled semi annually is a good program. I'm curious what you are getting. I'm 13 to 15 mpg on average. Closer to 13 in winter on winter blend and using 4 wheel drive more for commuting. I live in Northern Michigan so there are a lot of days in winter that require 4x4 so 12 to 13 is normal. Pretty normal for any full size truck really.
     
  17. Nov 16, 2018 at 3:39 PM
    #17
    Dano46

    Dano46 New Member

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    I’m in West Virginia with only 21000 plus mile. The weather had just change here the last two week and gas stations change to there winter grade fuel. Winter time 12.3-13.7 mpg and in summer 15 to 17.3 mpg
     
  18. Nov 16, 2018 at 3:59 PM
    #18
    Rob371

    Rob371 New Member

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    Steel bumpers front and rear,1.4" bilstien, KatSkinz Leather, rear airbags, halos.
    Sounds about right. I've barely ever seen 17 with mine other than maybe at 65mph on expressway with no load and a tail wind.

    I didn't buy a truck to pinch pennies.
     
  19. Dec 18, 2018 at 6:22 PM
    #19
    Claw

    Claw [OP] New Member

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    One front caliper is dragging as you suspected. Should I replace both or just one (Cardone caliper $155 ea, Toyota $355ea). No rebuild kits available? Shitty!
     
  20. Dec 18, 2018 at 6:28 PM
    #20
    Claw

    Claw [OP] New Member

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    Answer to question above: Spark plugs were replace 25k ago, the throttle body was cleaned/serviced 5k ago. Truck has 200k miles on it
     
  21. Dec 18, 2018 at 6:33 PM
    #21
    Steve89gt

    Steve89gt New Member

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    I’d do both. You might be able to find a low mileage replacement from a salvage yard; any truck 2007 and up is a suitable donor...
     
  22. Dec 18, 2018 at 6:52 PM
    #22
    vanoss101

    vanoss101 New Member

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    Yes both front calipers should be replaced. Also pads and rotors need to be replaced because they were overheated. Aftermarket rebuilt brake calipers have a high rate of failure but unfortunately that’s usually all that’s available and cost effective.
     
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  23. Dec 18, 2018 at 7:36 PM
    #23
    Claw

    Claw [OP] New Member

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    All the reviews on Cardone are positive? Or are there rebuild kits available in the USA, I am in Canada ?
     
  24. Dec 18, 2018 at 11:14 PM
    #24
    landphil

    landphil I know nothing, and I’m still confused.

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    Toyota part number for the caliper kit to do both sides front calipers is 044780C050, should run somewhere in the range of $30 CAD from your dealer. A tube of silicone brake lube and you’re set unless you need any new pistons. They are available from a dealer as well, around $45 each. P/N 477310C030.

    Of course, if you are paying shop labour rate to have the calipers rebuilt it won’t be worth it. If you have the tools and skills to do it, there is money to be saved, and you get a better result than Cardone reman.
     
  25. Dec 19, 2018 at 12:25 AM
    #25
    Jhayxian

    Jhayxian New Member

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    I.
    Also got same year truck just recently picked up..what should i change now that reached 130k miles
     
  26. Dec 19, 2018 at 8:31 AM
    #26
    Claw

    Claw [OP] New Member

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    Awesome, the Toyota partsman told me they don't make a rebuild kit. I called with the part number and, behold, I will have the parts tomorrow!
     
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  27. Dec 19, 2018 at 2:10 PM
    #27
    Crunch527

    Crunch527 Brute Force and Ignorance

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    Agree and I have had really poor luck with aftermarket brake parts being worth their weight in shit. I have had to re-do 2 brake jobs this year when I supposedly used the "best" NAPA parts available.

    I know the Toyota parts are expensive but they did last 300K...why not buy new Toyota calipers and associated parts and be confident the money was well spent.
     
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  28. Dec 19, 2018 at 2:16 PM
    #28
    Claw

    Claw [OP] New Member

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    I may end up doing that but I thought I would try the rebuild first
     
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  29. Jan 9, 2019 at 8:41 AM
    #29
    Claw

    Claw [OP] New Member

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    Rebuilt one caliper (internals were in great shape) but could not get one of the pistons out of the dragging caliper so I purchased a new one from Toyota and mileage is back to previous numbers. The snap rings for the dust covers take a bit of practice but once you figure it out they are relatively ease to install. Thanks to all for your help.
     
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  30. Jan 9, 2019 at 11:57 AM
    #30
    Crunch527

    Crunch527 Brute Force and Ignorance

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    Good deal...my experience has been similar when trying to rebuild a caliper that has been dragging...often times they have gotten so hot I have had to buy new.
     
    Last edited: Jan 10, 2019

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