1. Welcome to Tundras.com!

    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 Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Dropping MPG's

Discussion in '2.5 Gen Tundras (2014-2021)' started by nowayout, Aug 3, 2022.

  1. Aug 3, 2022 at 10:49 AM
    #1
    nowayout

    nowayout [OP] New Member

    Joined:
    Feb 24, 2017
    Member:
    #6517
    Messages:
    1,069
    Gender:
    Male
    First Name:
    Jason
    NY
    Vehicle:
    17 CM
    I have owned the Tundra since 2017 when I bought it new. In the first 5000 miles of owning it I put on a lift and 295 tires.
    I was getting around 16mpg.

    I wont mention towing mpg's as we know how bad that is.

    Over the past 5 years they have been dropping. Now I am at 13.9 mpg with the same driving same everything else.

    Anyone else noticing this with their truck?

    I am tempted to trade in on a diesel at this point.
     
    KFed likes this.
  2. Aug 3, 2022 at 10:54 AM
    #2
    Taco-Spike

    Taco-Spike Gateway from Tacoma World ~ ended up here

    Joined:
    Apr 25, 2021
    Member:
    #62293
    Messages:
    4,666
    Gender:
    Male
    512
    Vehicle:
    16 Tacoma TRD Sport DCSB / 17 Tundra 5.7L 4X4 CM
    Two Trucks
    Cleaning components might help, MAFS, throttle body, injectors, new air filter, correct tire pressure and alignment... I might be missing a few other things but it's a start
     
    Saltyhero13 and RobertD like this.
  3. Aug 3, 2022 at 10:59 AM
    #3
    Buckaroo

    Buckaroo New Member

    Joined:
    Nov 25, 2019
    Member:
    #39114
    Messages:
    245
    Gender:
    Male
    Central Ohio
    Vehicle:
    2017 Tundra 5.7L 4WD DC TRD
    2020 GD 2670MK Travel Trailer
    My '17 now seems to be getting the best gas mileage ever.....maybe 16+. Lots of variables. You running regular 87 octane or E85/88 octane. Higher percentage of ethanol will reduce mpg...
     
  4. Aug 3, 2022 at 11:04 AM
    #4
    Joe333x

    Joe333x Member

    Joined:
    Apr 4, 2019
    Member:
    #28632
    Messages:
    1,631
    Boston
    Vehicle:
    2019 Tundra CrewMax Platinum
    With the cost of diesel so much more than gas now its really not worth it. I loved my diesel and its milage but it was a 2006 so no EPA crap on it. 2007+ introduced all the DEF and other garbage that clogs your engine with soot, you can do the all EGR, DEF delete but it isnt cheap and you need to reverse it to pass inspection. I considered a 2500 Cummins for awhile before the Tudnra but just couldn't justify it. Dont get me wrong I still love diesels but just sucks that the EPA ruined them for us.
     
  5. Aug 3, 2022 at 12:08 PM
    #5
    frichco228

    frichco228 Valued Member

    Joined:
    Jan 9, 2020
    Member:
    #40952
    Messages:
    4,467
    Gender:
    Male
    First Name:
    Frank
    Virginia
    Vehicle:
    2016 Crewmax 4WD, TRD Offroad
    Eibach Pro Truck Stage 2 suspension, HD RAS, 285/75-18 Nokian Outpost AT, LoPro bed cover, TRD rear sway bar, DD 10 inch exhaust, and various other goodies
    Number one thing other than mechanical/maintenance items as mentioned in above posts is idle time. Idling, even a couple of minutes each time you start or to warm/cool the truck will significantly drop the MPG for the whole tank. Ive seen 2mpg drop for tank average if I let the truck idle (under 5 minutes) at first start of the day.
     
  6. Aug 3, 2022 at 12:10 PM
    #6
    eick

    eick New Member

    Joined:
    Jan 6, 2020
    Member:
    #40848
    Messages:
    864
    Gender:
    Male
    Vehicle:
    2020 CrewMax TRD Off Road
    I question 16 mpg on 295s and a lift. Is that from a rolling start at 55mph with a tail wind?

    Is this hand calculated by miles and gallons used or are you going by the computer?
     
  7. Aug 3, 2022 at 12:25 PM
    #7
    PermaFrostTRD

    PermaFrostTRD Tumescent Member

    Joined:
    Sep 20, 2016
    Member:
    #4612
    Messages:
    2,678
    Gender:
    Male
    Northern NY
    Vehicle:
    2019 CrewMax MGM Grocery Getter
    limited wannabe, suspension and tire improvements
    13.9 Sounds pretty solid, maybe even a little high with a lift and and 295/70 r18 tires (depending on the tire also). Sounds like the computer was still learning when reporting 16mpgs with that setup.

    As mentioned above, make sure you're hand calculating mpgs, (plus taking into account additional distance traveled due to increased circumference of the tire).
     
  8. Aug 3, 2022 at 1:00 PM
    #8
    GT87

    GT87 New Member

    Joined:
    May 13, 2020
    Member:
    #46516
    Messages:
    481
    Gender:
    Male
    First Name:
    Greg
    Western NY
    Vehicle:
    White 2021 SR5 O/R CM
    295/60r20 Toyo ATIII, 20x9 XD 820, 3/1 ReadyLift Carven Exhaust
    I have 295's with a lift and I typically get 15-16 mpg's on my daily commute. If I don't run the AC and stick to 65 on the highway I get over 16 mpg's.
     
    PermaFrostTRD likes this.
  9. Aug 3, 2022 at 1:37 PM
    #9
    Joe333x

    Joe333x Member

    Joined:
    Apr 4, 2019
    Member:
    #28632
    Messages:
    1,631
    Boston
    Vehicle:
    2019 Tundra CrewMax Platinum
    This is very true, its crazy how much fuel the 5.7 burns just at idle, you can watch the mpgs just start dropping if you sit at idle after a drive. I have an OBD that I watch the mpgs with and rolling down a hill doing 35mph with out your foot on the gas you still only get 45mpg lol.
     
  10. Aug 3, 2022 at 2:45 PM
    #10
    EmergencyMaximum

    EmergencyMaximum New Member

    Joined:
    May 28, 2022
    Member:
    #78904
    Messages:
    1,250
    Tundra shuts off gas supply when letting go of gas.
     
  11. Aug 3, 2022 at 3:23 PM
    #11
    Terndrerrr

    Terndrerrr guzzling dealer repellent

    Joined:
    Jul 8, 2019
    Member:
    #32965
    Messages:
    4,909
    Gender:
    Male
    Music City
    Vehicle:
    Dual 5.7s
    TRD Fox, RAS, 285/75 DTs, dual battery, SS3 Pro
    If it says 13.9 on your dash, it’s actually higher than that by the same % that a 295 is larger than the stock 275 is in circumference.

    Buying a diesel for better fuel economy is like refinancing your house into a higher interest rate mortgage. You’re paying higher up front costs, higher price per gallon of fuel, and (far) higher maintenance costs.

    There are reasons for buying a diesel. Slightly better daily or towing MPG ain’t it.
     
  12. Aug 3, 2022 at 3:25 PM
    #12
    Silver17

    Silver17 Used, but returned and sold as new member

    Joined:
    Oct 3, 2021
    Member:
    #68847
    Messages:
    2,574
    Gender:
    Male
    Eastern PA
    Vehicle:
    2017 TRD 4x4 Harrop SC
    Eibach pro 2.0s, toytec progressive mini AAL, ARE CX cap, Airlift bags, Harrop Supercharger, 650cc injectors, 77.5mm pulley, TRD Dual exhaust, J&L catchcan, Powertrax LSD, RRW RR7-H, 305/70r17 Toyo AT3s
    Make sure your calipers aren’t seized and causing the pads to drag excessively on the rotors. Happens a lot with age and corrosion. Your MPG doesn’t sound like anything to complain about on that size tire though based on what others get. Also, you’re traveling further than the odomoter says on the larger tires. If you’re tires have a 8% larger diameter for example you need to account for that in your calculations.
     
    HulkSmurf14 likes this.
  13. Aug 3, 2022 at 3:39 PM
    #13
    HulkSmurf14

    HulkSmurf14 ...Weighted Average...

    Joined:
    Aug 9, 2019
    Member:
    #34377
    Messages:
    1,905
    Gender:
    Male
    Vehicle:
    2014 Tundra Limited
    Tastefully enhanced...
    I've been getting the best fuel mileage since owning the truck...started out getting 11mpg (tho the S/C made me do it) and just recently hit 16.9MPG traveling through ID going 65mph...fully loaded and that blew my mind...that of course is hand-calc'd (fuelly.com) and not my DIC which said 22.7mpg...either fuel is better now, I'm driving like a grandpa, or the Cat Plates have made less drag coefficient ha! I agree on the brake calipers, check them, turn off the truck if waiting for a train or long light, and keep it low on the MPH...
     
  14. Aug 3, 2022 at 3:46 PM
    #14
    Joe333x

    Joe333x Member

    Joined:
    Apr 4, 2019
    Member:
    #28632
    Messages:
    1,631
    Boston
    Vehicle:
    2019 Tundra CrewMax Platinum
    If it shut off completely the engine would need to be restarted. It's not a manual where keeping it in gear can keep the engine turning.
     
  15. Aug 3, 2022 at 4:16 PM
    #15
    EmergencyMaximum

    EmergencyMaximum New Member

    Joined:
    May 28, 2022
    Member:
    #78904
    Messages:
    1,250
    Motor is not being disengaged from the transmission. It is still being spun by it. When the rpms get lower, fuel flow is restarted. This isn't something new. Car manufacturers have been doing this for some time.
     
  16. Aug 3, 2022 at 5:14 PM
    #16
    agrestic1

    agrestic1 New Member

    Joined:
    Apr 7, 2018
    Member:
    #14263
    Messages:
    299
    Gender:
    Male
    Vehicle:
    2016 CrewMax
    AMP Research PowerStep, AMP BedStep Bumper Step, BedRug Carpet Bed Mat, Bazooka Powered Subwoofer Tube
    Steady 14, 15 mpg here.., According to the dash gauge..
     
  17. Aug 3, 2022 at 5:16 PM
    #17
    EmergencyMaximum

    EmergencyMaximum New Member

    Joined:
    May 28, 2022
    Member:
    #78904
    Messages:
    1,250
    Please pardon my statement. I don't mean any ill intention, but...
    Maybe you've been gaining weight? Again, I'm sorry, but it's only a theory.

     
    GT87 likes this.
  18. Aug 3, 2022 at 5:28 PM
    #18
    Wahayes

    Wahayes Older I get the wiser I realize my dad was

    Joined:
    Sep 23, 2019
    Member:
    #36539
    Messages:
    1,745
    Gender:
    Male
    First Name:
    Will
    Vehicle:
    2017 tundra limited
    325/60r20 falken at3w, 2.25 dobinsons ,20x9 +20 fuel torque wheels, leer xr100, bmc
    13.9 sounds legit. I get 13.5 on 325/60r20 which is about 36 in tires
     
  19. Aug 3, 2022 at 6:44 PM
    #19
    Joe333x

    Joe333x Member

    Joined:
    Apr 4, 2019
    Member:
    #28632
    Messages:
    1,631
    Boston
    Vehicle:
    2019 Tundra CrewMax Platinum
    Once the you see the RPMs drop below 1000, the transmission it no longer spinning the engine, go ahead and pop it into neutral, you'll see no difference, the engine is just idling. I have an OBD MX+ that connects to the computers MPG reading, while under engine braking going down hill you can see it go into the 60s, then once all engine braking stops and the engine idles while rolling its around 45, the fuel is not just off from the engine. When your foot is not on the gas but the rpms are above 1000, then the transmission is spinning the engine, once its below that it is not. After your weight comment I'm guessing you're just trolling here. The amount of weight someone would need to gain to affect mpgs would have to be very significant.
     
  20. Aug 3, 2022 at 7:07 PM
    #20
    EmergencyMaximum

    EmergencyMaximum New Member

    Joined:
    May 28, 2022
    Member:
    #78904
    Messages:
    1,250
    There is a pronounced change in tachometer reading and thrust when you ever so slightly touch pedal after rolling. My other vehicle, Toyota venza is even more pronounced if you keep rolling and let the car slow down. Tranny downshifts at 35, there's pretty generous engine brake and then downshifts again at 25, with even more engine break and about 1-2 seconds later, you feel when fuel starts flowing and your mpg drops from 90 to about 60 and there's no resistance anymore.

    If your computer is reading otherwise, then perhaps I may be wrong. I have serious doubts though that engine braking would be that substantial with fuel flowing to the cylinders.

    Re: weight, if the OP is doing aggressive acceleration, extra 100 lbs will definitely be noticable. I can notice it when I'm hauling a couple bags of mortar in my pickup. It's a bit tongue on cheek comment, hopefully OP didn't gain that much weight.:ballchain:
     
  21. Aug 4, 2022 at 5:15 AM
    #21
    GT87

    GT87 New Member

    Joined:
    May 13, 2020
    Member:
    #46516
    Messages:
    481
    Gender:
    Male
    First Name:
    Greg
    Western NY
    Vehicle:
    White 2021 SR5 O/R CM
    295/60r20 Toyo ATIII, 20x9 XD 820, 3/1 ReadyLift Carven Exhaust
    My daily commute. Probably 60% highway and 40% regular roads. 3 inch lift with 295/60r20 tires with tow/haul on.

    Commute mpg.jpg
     
    PermaFrostTRD likes this.
  22. Aug 4, 2022 at 6:02 AM
    #22
    Jaypown

    Jaypown New Member

    Joined:
    Aug 19, 2019
    Member:
    #34878
    Messages:
    1,704
    Gender:
    Male
    First Name:
    Justin
    Rubber City
    Vehicle:
    2020 Tundra TRD Sport CM 4x4 MGM
    Could be some carbon build up, sticky caliper(s), unnoticed heavy foot, alignment, tire pressure/condition, change of commute route etc.
     
  23. Aug 4, 2022 at 9:59 AM
    #23
    endagon

    endagon New Member

    Joined:
    May 25, 2019
    Member:
    #30978
    Messages:
    412
    Gender:
    Male
    Vehicle:
    16 Tundra SR5 5.7
    Mine's been the opposite. Any time it's driven over a half hour the numbers get vastly better. Even towing the little boat up north and weighted down in the bed pretty good I averaged over 18 mpg last weekend. It used to be this truck would only get over 15 if I kept it under 60 mph. Something loosened up. Heck it has 5w-30 oil in it and that should mean increased fuel use
     
    frichco228 likes this.
  24. Aug 4, 2022 at 10:03 AM
    #24
    Jaypown

    Jaypown New Member

    Joined:
    Aug 19, 2019
    Member:
    #34878
    Messages:
    1,704
    Gender:
    Male
    First Name:
    Justin
    Rubber City
    Vehicle:
    2020 Tundra TRD Sport CM 4x4 MGM
    Great input to OP's question. :thumbsup:
     
  25. Aug 4, 2022 at 10:56 AM
    #25
    Silver17

    Silver17 Used, but returned and sold as new member

    Joined:
    Oct 3, 2021
    Member:
    #68847
    Messages:
    2,574
    Gender:
    Male
    Eastern PA
    Vehicle:
    2017 TRD 4x4 Harrop SC
    Eibach pro 2.0s, toytec progressive mini AAL, ARE CX cap, Airlift bags, Harrop Supercharger, 650cc injectors, 77.5mm pulley, TRD Dual exhaust, J&L catchcan, Powertrax LSD, RRW RR7-H, 305/70r17 Toyo AT3s
    That sandwich looks delicious, is that white bread or potato bread?
     
    nowayout[OP] likes this.
  26. Aug 4, 2022 at 10:59 AM
    #26
    Jaypown

    Jaypown New Member

    Joined:
    Aug 19, 2019
    Member:
    #34878
    Messages:
    1,704
    Gender:
    Male
    First Name:
    Justin
    Rubber City
    Vehicle:
    2020 Tundra TRD Sport CM 4x4 MGM
    Opinions aren't truths. They're just opinions. :bucket:
     
  27. Aug 4, 2022 at 11:01 AM
    #27
    Ted4311

    Ted4311 Don't Sweat The Small Stuff

    Joined:
    Mar 18, 2017
    Member:
    #6845
    Messages:
    1,438
    Gender:
    Male
    First Name:
    Tim
    SOMD
    Vehicle:
    14 Tundra MGM TRD-OFFROAD 4X4
    A LOT... NEVER ENDS
    I thought with my lift and 35s that getting 13 mpg was fantastic! Damn 16mpg and there is fussing!? 15-16.... I call bad math
     
    AZBoatHauler likes this.
  28. Aug 4, 2022 at 11:02 AM
    #28
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

    Joined:
    Aug 13, 2019
    Member:
    #34576
    Messages:
    6,926
    Gender:
    Male
    First Name:
    Adam
    So.Arizona
    Vehicle:
    2017 CrewMax 4x4, 2017 LandCruiser, 2005 Sequoia 4x4
    Demello / SOB Fab Bumpers, SuperWinch, WKOR sliders, RCI skids, Baja Designs lighting, Billy 6112 and 5160 w/ CB +2, JL Audio with Alpine HU, DD 10" Exhaust, LED headlights, Rago fab mounts, 35” BFG, HAM radio
    Current mileage seems in line with mine and what I’ve seen. I’m on 285/70 18s with just over 2” of lift and see 13 around town, 15-16 on the highway. 9-10 towing.
     
  29. Aug 4, 2022 at 11:06 AM
    #29
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

    Joined:
    Aug 13, 2019
    Member:
    #34576
    Messages:
    6,926
    Gender:
    Male
    First Name:
    Adam
    So.Arizona
    Vehicle:
    2017 CrewMax 4x4, 2017 LandCruiser, 2005 Sequoia 4x4
    Demello / SOB Fab Bumpers, SuperWinch, WKOR sliders, RCI skids, Baja Designs lighting, Billy 6112 and 5160 w/ CB +2, JL Audio with Alpine HU, DD 10" Exhaust, LED headlights, Rago fab mounts, 35” BFG, HAM radio
    But if you do it right they offer plenty of smiles per gallon.
     
    LS3 and Sierradevil like this.
  30. Aug 4, 2022 at 11:23 AM
    #30
    eick

    eick New Member

    Joined:
    Jan 6, 2020
    Member:
    #40848
    Messages:
    864
    Gender:
    Male
    Vehicle:
    2020 CrewMax TRD Off Road
    I wish I could get 13. Although I do no highway driving, it’s all city and all short trips unless I go camping.

    My tank average is about 11mpg based on hand calc from gas receipt and miles driven and accounting for a few percent size difference. Computer says 9.5 mpg

    On 295/70/18s and just 2.5in lift
     

Products Discussed in

To Top