[MadMac]

Filled my truck up the other day and checked "fuel remaining" and it indicated I had 96mi. left which at 25mpg (which my mpg indicator read) left me with approx. 3.5 gals in the tank. So I began to fill and by the time I topped off I had put 22.2 gal. in it. So obviously the 21 gal. capacity must be "usable fuel"? The pump was inspected 3 months ago so it should be correct. Anybody else had this happen to them? Not complaining or anything, just curious. Madmac

 

[RollyPollieBenito]

I drove until the light flash and the bell dings and it was 20.9 gal with one extra pump click after fill.

 

[Rockcrawlerdude]

Zr2 must have an extended range tank?

 

[RollyPollieBenito]

Zr2 must have an extended range tank?

That would be awesome if it does have a bigger tank.

 

[MadMac]

Well I d/n have any "low fuel" lights or dings at the time of my fill up, but maybe I've got a "freak" truck?? I'm pretty good at calculating fuel range since I've ridden motorcycles back and forth across this great nation for 47 years of my life. But maybe my local fuel station's pumps are off somewhat?

 

[RollyPollieBenito]

Well I d/n have any "low fuel" lights or dings at the time of my fill up, but maybe I've got a "freak" truck?? I'm pretty good at calculating fuel range since I've ridden motorcycles back and forth across this great nation for 47 years of my life. But maybe my local fuel station's pumps are off somewhat?

I got my fingers cross for a bigger tank.

 

[Rockcrawlerdude]

Google says 21gal, so I don't know how you fit that much fuel in there.

Pump had a sticker showing an inspection date from the state?

 

[MadMac]

Google says 21gal, so I don't know how you fit that much fuel in there.

Pump had a sticker showing an inspection date from the state?

Yes, it looked like a state sticker(white w/ black lettering & date) stamped on it and placed over the joint of pump and access cover to prevent tampering. It appeared to me. Madmac!

 

[RollyPollieBenito]

I would run the diesel low like the last time and fill up at a different station. Just to cross check and varify.

 

[Hookster]

Ok guys, the tank is the same as their big brothers 25 gallons. But the filler neck is placed deeper in the tank. This allows for the foaming of the Diesel when filling. If you fill to the first pump click and then fill slow you can add up to 4-5 gallons. I put 3-4 extra every time. Some people will say this is bad due to expansion. This information came from a reliable source from GM.

 

[Rockcrawlerdude]

Shoot. I'm gonna try to squeeze in a few more gallons next time just to test this.

 

[TrailDog]

I keep putting in fuel long after the pump clicks off all the time. Once when I was making a long trip and putting in fuel right before I left I filled her all the way to the top of the neck.

 

[Burgess159]

Same. Drove 100 miles before it moved off full.

 

[18Z71Minimax]

Could maybe a couple gallons above the stated capacity be in reserve since it's not good to run a diesel dry?

 

[Shaun Harrison]

Had the same thing happen to my 2016 Z71 while driving to South Carolina... Truck took 22.5 gals.

 

[Burgess159]

Filled this up in KY after we left my sister's to visit my parents in Ohio and topped it off completely and added Howe's and it's still on full

 

[Baggerjack]

So I began to fill and by the time I topped off I had put 22.2 gal.

I have also done that. It was surprising. I've never had a vehicle exceed the captivity of the tank.

 

[AndyZ71]

while watching some online reviews, when they did fuel test they always let it auto click and then waited 30 seconds for the foam to die down and always got quite a bit more fuel in. I try to do this, but often don't have the patience.

 

[turbodiverart]

I just had my first long trip. I had filled it up to the neck after letting foam die down (this was it's first fill up). I then drove 629 miles from New Jersey, thru the mountains of northern Maryland and West Virginia into Lexington KY. The fuel light had been lit up for a bit and the DIC had given up telling me range after saying 60 miles left, I drove probably another 25-30 miles as I was in the Daniel Boone's and there were no gas stations or exits for a while. I stuffed the tank to the rim and it took 22.9 gallons. Since this was only the second time filling up since I got the truck I quickly learned that the geniuses at GM didn't size the opening to fit the larger diesel truck nozzle..... It was a long slow fill as that'ts the nozzle I had pulled up to!

 

[oak1971]

I fill till it clicks off, wait 30 seconds and then fill verrry slowly till it stops again. I have not ever run it down much past 1/4 tank before topping off.