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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

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    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 From Tacoma World. Fueled by bacon & bourbon

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    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
     
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  3. Aug 3, 2022 at 10:59 AM
    #3
    Buckaroo

    Buckaroo New Member

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    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

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    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

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    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

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    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

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    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

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    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.
     
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  9. Aug 3, 2022 at 1:37 PM
    #9
    Joe333x

    Joe333x Member

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    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 ♡'s MPGs!!

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    Tundra shuts off gas supply when letting go of gas.
     
  11. Aug 3, 2022 at 3:23 PM
    #11
    Terndrerrr

    Terndrerrr it's good to get lost once in a while

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    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.
     
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  12. Aug 3, 2022 at 3:25 PM
    #12
    Silver17

    Silver17 Well, that’s just like uh, your opinion man

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    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.
     
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  13. Aug 3, 2022 at 3:39 PM
    #13
    HulkSmurf14

    HulkSmurf14 ...Weighted Average...

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    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

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    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 ♡'s MPGs!!

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    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 4:43 PM
    #16
    07DCLimited

    07DCLimited New Member

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    Have your parking brake checked to ensure that the shoes aren't grabbing slightly.
     
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  17. Aug 3, 2022 at 5:14 PM
    #17
    agrestic1

    agrestic1 New Member

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    Steady 14, 15 mpg here.., According to the dash gauge..
     
  18. Aug 3, 2022 at 5:16 PM
    #18
    EmergencyMaximum

    EmergencyMaximum ♡'s MPGs!!

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    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.

     
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  19. Aug 3, 2022 at 5:28 PM
    #19
    Wahayes

    Wahayes Older I get the wiser I realize my dad is

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    13.9 sounds legit. I get 13.5 on 325/60r20 which is about 36 in tires
     
  20. Aug 3, 2022 at 6:44 PM
    #20
    Joe333x

    Joe333x Member

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    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.
     
  21. Aug 3, 2022 at 7:07 PM
    #21
    EmergencyMaximum

    EmergencyMaximum ♡'s MPGs!!

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    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:
     
  22. Aug 4, 2022 at 5:15 AM
    #22
    GT87

    GT87 New Member

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    My daily commute. Probably 60% highway and 40% regular roads. 3 inch lift with 295/60r20 tires with tow/haul on.

    Commute mpg.jpg
     
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  23. Aug 4, 2022 at 6:02 AM
    #23
    Jaypown

    Jaypown New Member

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    Could be some carbon build up, sticky caliper(s), unnoticed heavy foot, alignment, tire pressure/condition, change of commute route etc.
     
  24. Aug 4, 2022 at 8:48 AM
    #24
    Sierradevil

    Sierradevil New Member

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    V8 life fellas. You play V8 whocares about MPGs.
     
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  25. Aug 4, 2022 at 9:59 AM
    #25
    endagon

    endagon New Member

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    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
     
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  26. Aug 4, 2022 at 10:03 AM
    #26
    Jaypown

    Jaypown New Member

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    Great input to OP's question. :thumbsup:
     
  27. Aug 4, 2022 at 10:54 AM
    #27
    Sierradevil

    Sierradevil New Member

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    Truth hurts I guess:sandwich:
     
  28. Aug 4, 2022 at 10:56 AM
    #28
    Silver17

    Silver17 Well, that’s just like uh, your opinion man

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    That sandwich looks delicious, is that white bread or potato bread?
     
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  29. Aug 4, 2022 at 10:57 AM
    #29
    Sierradevil

    Sierradevil New Member

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    Kings Hawaiian bread...:thumbsup:
     
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  30. Aug 4, 2022 at 10:59 AM
    #30
    Jaypown

    Jaypown New Member

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    Opinions aren't truths. They're just opinions. :bucket:
     

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