Miles DTE on a 26 gallon tank 4x4 ORG limited

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Llamafood

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Anyone else getting insanely low DTE milage projections on their trucks ? Everytime I run my fuel gauge until it reads low I fill up and it only takes 23 gallons. My DTE reads 320 when full. When I do the math it's calaculated as if I only have a 23 gallon tank but my limited is supposed to come standardwitha 26. Took it to the dealer and they said it has a 3 gallon reserve and this is normal ?? Super annoying. My wife's Tesla has a longer range than this.
 

turkeybird56

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I have this issue also, and have a call into my SA at Dealership. Next time I go in, I am going to have them hook up Witech, since ECU locked, and get the EVIC set up for 26 gallon tank, not the 23 gallons stats it is displaying, all IMHO.....

added: LIMA: Doing the math, is shows U only getting 12-14 mpg, something way off there......

Ie., divide DTE by gallons.......

FWIW: When I took 4050 mile trip in August, I neva let fuel tank under 1/4 tank, just in case...and hand calculated got average 22 mpg on Hwy
 
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Llamafood

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I have this issue also, and have a call into my SA at Dealership. Next time I go in, I am going to have them hook up Witech, since ECU locked, and get the EVIC set up for 26 gallon tank, not the 23 gallons stats it is displaying, all IMHO.....

added: LIMA: Doing the math, is shows U only getting 12-14 mpg, something way off there......

Ie., divide DTE by gallons.......

FWIW: When I took 4050 mile trip in August, I neva let fuel tank under 1/4 tank, just in case...and hand calculated got average 22 mpg on Hwy
Let me know what they say. I average 15 to 16 typically hand calculated at fill up.
 

turkeybird56

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OK< LAMA< but gonna be a while as in my next trip to dealer be for oil change (I get $18.00 changes, lol), but be a good while, but I will remember to post back whenever..My SA did send me an email and he is allegedly researching...
 

Tach_tech

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The low fuel light doesn’t come on when it’s empty, comes on when it’s low. 3 gallons is about right. So if you put 23 gallons in that’s your 26 total. If you ran it till it died you’d likely get the full 26 in it.

The reserve is there so you don’t run out and help prevent the fuel pump from burning out since the fuel is what cools the pump.

The fuel tank capacity can’t be adjusted with witech. The only thing that could possibly be done is add the sales code for the bigger tank, but that’s the 32gal tank.
 

stimpy433

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They do it to keep the stupid people from running out of gas....
 

turkeybird56

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BSV: When full my only shows like 380-410, so I know set up for 23 gal, and not 26 gal tank I got. Kinda annoys me, but not gonna make extra trip till I have to go to dealer and will get with SA and have changed for 26 gal tank as that is what is installed.

Guess shall see.....
 

Tach_tech

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BSV: When full my only shows like 380-410, so I know set up for 23 gal, and not 26 gal tank I got. Kinda annoys me, but not gonna make extra trip till I have to go to dealer and will get with SA and have changed for 26 gal tank as that is what is installed.

Guess shall see.....

It can’t be set for a 23gal tank, it’s not a possibility. The dealer can’t change it. If there is an issue with how the PCM is calculating DTE the only way it could be changed is through a software update that FCA would have to release.

The PCM calculates DTE based on current and historical fuel mileage.
 

turkeybird56

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OK, well as usual, slightly confused, my senility showing. I have a good SA at dealership, so, honestly though, IMHO, though the EVIC is nice, and the info, if U wanna drive, gotta put the ole gas in the tank...LOL
 

Tach_tech

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OK, well as usual, slightly confused, my senility showing. I have a good SA at dealership, so, honestly though, IMHO, though the EVIC is nice, and the info, if U wanna drive, gotta put the ole gas in the tank...LOL

Manufactures have had similar set ups for years. Even if you ran till the gauge showed empty you still wouldn’t get the full 26 gallons. They calculate the software to show empty sooner than it is to avoid running out of gas and to help the fuel pump live longer. Always running close to empty can be harmful for the pump.
 

turkeybird56

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TACH: Had an ED before this Hemi, my 3rd one, and dat is a Big issue with the diesels. I never run lower than 1/4 tank, but that is me. We shall see next time I see my SA... Still gotta get a tonneau cover and bed rug and maybe 60" rear light strip and curt connector. That be it for the truck. ALL good tho...
 

OzCop

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When I had my 2014 Long Horn, it had the 32 gal. fuel tank. The most I was ever able to put in it was 26 gallons...that was running it till it said I had only 50 miles left before empty. I just assumed it had a few gallons in reserve...
 

Rich T

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what happens when the DTE hits zero but you still have 3 gallons in reserve? does the computer shut you down or do you get to limp to a station?
 

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