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38 Gal tank experiences....

Discussion in '3rd Gen Tundras (2014-2021)' started by KeithM, Mar 19, 2018.

  1. May 7, 2021 at 5:54 AM
    #451
    1/68AR Ventre A Terra

    1/68AR Ventre A Terra New Member

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    Changing to 18 inch Tundra rims. Valhalla Shields inbound. AJT design interior de-chroming…
    In all my Chevy’s the yellow light would come on and at that point you had about 5 gallons left no matter the size of the tank. It is usable gas, we just don’t know how much is in there left as we get 10-13.5 mpg. Also, like all Toyota’s there is a vacuum on the system and when you take off your gas cap there is that rushing sound of air back in the tank. On my 4runner, if you run it down, it is a noticeable sound. Also on a 4runner, if your cap can’t make that seal, you will get a check engine light. I haven’t had this Tundra long enough to know if that happens or not, but I’m pretty sure you can run all 38 gallons out of the tank. Not going to find out though. I only run the m.p.h/distance on the tank display on my Tundra as I only use it for towing and the average mpg on this tank display is useless to me. I know it will be crap just like my Chevy’s which only got 10 mpg when towing.
     
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  2. May 7, 2021 at 7:13 AM
    #452
    Netmonkey

    Netmonkey Don't be a Dumbass

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    The 2016 tundra has either a 26 gallon or a 38 gallon tank. If you put 29 gallons into the tank, that means you have the 38 gallon tank. The 38 gallon tank does not have "8 gallons of unusable fuel." If you wanted to, you could burn the tank very close to dry. I have pumped 35 gallons into my tank. At that low of a fuel level, the truck was not sputtering or showing any signs of fuel starvation. I could have run the fuel down even farther. The distance to empty display and the MPG display are estimations.... they are not exact. If you want exact values, then you need to calculate your mileage by hand. That way, when the low fuel light comes on, you will know exactly how many miles that you have left in the tank. For me, when the low fuel light comes on, I have 8 gallons left in the tank. On the highway (unloaded), that means another 112 miles until empty (8 gallons X 14mpg). If I was towing a travel trailer, that would be 64 miles until empty (8 gallons x 8mpg).
     
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  3. May 7, 2021 at 7:15 AM
    #453
    CurtisLemansky

    CurtisLemansky 5.7 or Die

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    Interesting. Does it take that every time now or just the one time?
     
  4. May 7, 2021 at 8:55 AM
    #454
    Yota303

    Yota303 New Member

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    You are correct I’m not sure where I came up with the 30 gal tank I thought I remembered reading it in the owner’s manual when I first got the truck, I’m assuming I have the 38 gallon tank as I have put 30 gallons in it at its lowest point that I’ve driven it to, good advice through all of this to calculate mileage manually especially while towing etc. also good to know there’s a little more of a buffer from when the low fuel light comes on to when the tank is actually empty.
     
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  5. May 7, 2021 at 9:28 AM
    #455
    Netmonkey

    Netmonkey Don't be a Dumbass

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    Technology is great, but it has made us forget how or why do things. My first car was a 1979 oldsmobile delta 88. It did not have a distance to empty display or a mpg display. Hell, it did not even have a low fuel light. I had to pay attention to the needle on the fuel gauge. I had to learn how much fuel that I had left (or how many more miles that I could travel) by how far the needle was over the "E". And I did that by hand calculating the mileage and using the odometer (This car did not even have a trip odometer). I did this hand calculation process with every vehicle that I have owned since. When I purchased the Tundra, I still hand calculated the mileage to verify those displays. I found that those displays were cool, but not 100% accurate. For me, the MPG display shows about 1-2mpg better than what I am actually getting. Also, the DTE display goes to zero way before I am out of fuel. I am sure the larger tires have also thrown those displays off.
     
    Last edited: May 11, 2021
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  6. May 7, 2021 at 11:28 AM
    #456
    Rodtheviking

    Rodtheviking New Member

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    Twice now, just filled and it was 34ish.
     
  7. May 11, 2021 at 12:39 PM
    #457
    java230

    java230 New Member

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    I put 32.2 in mine.... That was when the light just said refuel. And my CC maxed out so it may have been a little more.
     
  8. May 11, 2021 at 1:01 PM
    #458
    Dan_Gleesac14

    Dan_Gleesac14 New Member

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    sounds about right. i've only ever gotten to fill my truck up to just under 31gal since I've owned it.
     
  9. May 12, 2021 at 7:56 AM
    #459
    Boerseun

    Boerseun Super White

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    Hand calculations can be far off also. Especially when you are down to the last little bit of gas (or last few miles, whichever way you look at it.) What do you use for MPG? It's a guess since you have no idea what MPG you will be getting those last 10 miles - you run into a traffic jam and stop-go conditions your MPG drops to 5 MPG and your calcs are not even close, while the computer will be recalculating as you go.

    Bottom line, it is not possible to be 100% accurate, no matter how it is calculated, since there are way too many variables. Due to the size of the tank (actual length) when you are on a steep incline the amount of usable fuel will be a lot less than when you are on a flat surface. That alone will throw any calculation, manual or computer, completely out the door.
     
  10. May 12, 2021 at 8:26 AM
    #460
    Netmonkey

    Netmonkey Don't be a Dumbass

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    o_O

    Hand calculations are damn near close to exact. If I drive 400 miles and put 30 gallons into the tank to fill it, then that is 400/30=13.33 mpg. It doesn't get much easier than that. Hand calculations show your mpg for the previous tank. It does not show your current mpg. However, I have done the hand calculations based on the different driving conditions. For example (in my Tundra), I know that if all the miles are highway miles, then I am getting around 15mpg. If the miles are city miles, then I am getting about 13mpg. If the miles are towing a travel trailer, then I am getting about 8mpg. I won't know the exact mpg in that condition until I full up the tank again, but I have a very close approximation based on previous fill ups. This hand calculated projection is more accurate than the truck's DTE or MPG displays.
     
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  11. May 12, 2021 at 8:40 AM
    #461
    The Towse Tundra 2.0

    The Towse Tundra 2.0 New Member

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    I filled up my tank yesterday and put 31 gallons in. My needle was just above the empty line without the gas light on. That would imply 7 gallons till totally empty at 12 mpg. That’ll give me about 85 miles left to drive. It seems accurate to me and I believe that’s what my dash indicated as well.
     
  12. May 12, 2021 at 9:22 AM
    #462
    CurtisLemansky

    CurtisLemansky 5.7 or Die

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    I pulled up my fuel level gauge on OBDLINK the last time I hit Low Fuel (0 Miles) and it was around 6-7 gal left.
     
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  13. May 12, 2021 at 10:45 AM
    #463
    Boerseun

    Boerseun Super White

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    After the fact is accurate, but the response was on the discussion about remaining fuel and remaining DTE at any time. The computer keeps updating the DTE as you go; even if not 100% accurate, it gives an idea. Hand calculation can only be done after the fact when you fill up. While accurate, it does not help you when you are trying to determine how much further you can go before filling up.

    Not a big deal, just saying.
     
  14. May 12, 2021 at 10:54 AM
    #464
    Netmonkey

    Netmonkey Don't be a Dumbass

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    I think that we are close to agreement here. However, I think that my current tank estimations (based on previous hand calculation history) are more accurate than the DTE and MPG displays. The DTE display goes to zero way before your are actually out of fuel.
     
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  15. May 13, 2021 at 6:01 AM
    #465
    Jaypown

    Jaypown New Member

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    Just to add on to your guys' discussion, a good point to mention is how the DTE only goes down and does not adjust. Say the first half of your tank is towing and you're burning through your gas and DTE is dropping. You drop off the trailer and jump on the highway at 65mph and cruise. DTE will adjust and begin to decrease at a slower rate. But it never goes up. My wifes accord will recognize the change in driving and increase. I'll fill up the tank and it'll show mid 400's DTE and jump on the highway and cruise easily and it'll increase to high 500's.

    Hand calculations will still show my average for the tank and be very accurate but I won't know individually the mpg on different driving habits on that tank.
     
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  16. May 14, 2021 at 5:10 AM
    #466
    nmjameswilson

    nmjameswilson New Member

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    I just bought a 2021 Limited a couple weeks ago and it takes 30 gallons. I received a warning that I had low fuel with THREE MILES TO EMPTY. I went another 9 miles and was fine.
    Does anyone know how to change the low fuel alert to something higher?

    I am going to disconnect the battery and see if that helps as described above.
     
  17. May 14, 2021 at 5:55 AM
    #467
    Jbehredt

    Jbehredt Burgeoning member

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    The one that gives me a reason to be upset of course!
     
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  18. Jun 16, 2021 at 1:23 PM
    #468
    LarryDangerfield

    LarryDangerfield New Member

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    This did not age well
     
  19. Jun 17, 2021 at 8:25 AM
    #469
    t-rey1

    t-rey1 New Member

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    15mi to empty only took 30 gallons and $80. Got 500mi out of the tank
     
  20. Jun 17, 2021 at 8:40 AM
    #470
    BrakeDust

    BrakeDust New Member

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    16.666666666666666.... MPG

    Impressive. Most impressive.
     
  21. Jun 17, 2021 at 9:14 AM
    #471
    glowblue

    glowblue From time to time

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    I ran mine about 30 miles after DTE went to zero and put 34.6 gallons in with 520 miles just yesterday - 14.9 mpg for the tank.
     
  22. Jun 17, 2021 at 10:00 AM
    #472
    andnyleswillriot

    andnyleswillriot slopestyle-ski.com

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    So has anyone figured out at what point do you expose the fuel pump within the 8 gallon reserve and damage it? 34 gallons of use? Etc?
     
  23. Jun 17, 2021 at 11:02 AM
    #473
    t-rey1

    t-rey1 New Member

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    Yeah. 1/2 of it was an out of town trip highway mileage
     

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