I picked up the truck end of Feb 2022 and I am averaging 8.4L/100km (28mpg) after 10000km (6213miles).
My driving is 80% highway with about 20% stop and go, only a little bit of towing so far.
Some trips I can get down to 7.8. (30mpg)
Very pleased with the results as my 2021 Silverado was 12.5l/100 (18.8mpg) with the 5.3.
To date I have used 18l of def which I don't even worry about as I buy in bulk at the pump.

 

On a 1900 mile trip in my Denali I got 30.3 mpg, cruise set at 79 most of the way.

My ZR2 so far is getting 21.3 despite a third of the miles covered being in a massive windstorm. I'm impressed.

 

Beat the computer's previous Best of 36MPG with a brief 38. 50Mil average 37.9 MPG. A bit insane. Actual tripometer 700mile roundtrip was 32MPG. My setup:

'17 Z71
Stock - front air dam, no tune
OEM Tires (6mons new) @ 40psi
Flat midwest County / State / US highways; no Interstates
Windows up & A/C on (80-90F ambient)
55-60 MPH cruise set -- yea I'm a Grandpa driver!

 

Gotta love the range with the Titan tank. I filled up and reset trip "B" and still shows 800+ of range left. for me the best part is when my 6K lbs trailer is attached and I can still easily go 300+ miles on a tank of fuel.

I know I took the pic on the "25" mile screen but running on some of the local roads at 55 still amazes me.

 

Gotta love the range with the Titan tank. I filled up and reset trip "B" and still shows 800+ of range left. for me the best part is when my 6K lbs trailer is attached and I can still easily go 300+ miles on a tank of fuel.

Nice!

Do you think a bed topper makes any difference on mileage? I noticed one in your profile pic.

There's guys who swear they do but it seems to be another case of "it depends" ...

 

got that loaded to the gills, 3 ladders on the rack, 2 ton mini split, all the goodies, decked box loaded with tools, 25lb refrigerant, oxy torch... cooler. went to palm springs 101 inside and 111 outside... fun times. ps only got 20 on the way home...

 

Same with me decked tool box, 2 ladders, drills, screw box and so on and a bunch of other stuff.....I really like this truck.

 

Fully loaded, towing a ~3000lb travel trailer on a windy day. Roughly 15.3mpg

 

Hello all, just picked up a 2018 ZR2, just ran through my first tank. Filled it up at 1/4, avg MPG was 22.0 with most highway driving at 70mph. I also added red line 85 plus. I drive pretty conservative, feather the gas and slow acceleration. It's a bit cold here, was around 30 degrees on that last tank. Is my average mpg normal or on the low side? Bone stock, no lifts or mods. Anything I can do to get my mpg up?

 

My ZR2 diesels(2018 and 2022) always got/get their best mpg driving 45-60mph. Normally around 27-29mpg. Mileage drops off a little at highway speeds(65-75mph). At highway speeds it's more like 25-26mpg.

I did notice a slight drop in overall mpg after adding my light bar with 2 double row 12" RC LED light bars. Makes sense though. That's a decent amount of added wind resistance.

 

Agreed. 55-60 is the sweet spot. Best I’ve seen is 32 over a 400 mile trip to the beach and back to the valley. Mix of windy and straight roads, mix of flat ground and mild grades….speed rarely exceeded 60. If I do 65 on I5 on relatively flat ground it’ll average 27/28ish. My2016 z71 averaged closer to 31. Aggressive tires and more weight on the ZR2/Bison are impactful.


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I would consider 22mpg low in my experience. I live in NH and drive in plenty of very cold weather with studded snow tires and I still average 25-26mpg.

I'm very light on the throttle and run standard sized tires though. Both of which would have significant impact on your fuel efficiency.

 

I'm very light on the throttle and run standard sized tires though. Both of which would have significant impact on your fuel efficiency.

And there's no front air damn on the ZR2, and it sits higher. Those 2 things kill MPGs at highway speeds. The ZR2s won't get the mileage that WT/Z71s get.

 

CCSB, best was on stock tires with air dam, CC set to 55-60 and flat with no wind. I always pull 30+ on highway. The trip computer is normally a little high compared to hand calc, like 1-2 off.

 

Full time rooftop on a rack in the back with the Honda 3300 generator stowed in the bed I get between 22-26 mpg , with teardrop in tow between 18 -22 mpg . Lots depends on terrain , wind , stop and go , and of course mph . Lower speeds gets better mpg .

 

Did this the other day on HWY 97 in Oregon with the cruise control set at 72mph.
My best is actually just shy of 50mph, coming off a mountain from Susanville to Mt. Shasta one winter. I accidently reset the meter.
My most recent tune is by Great White North Diesel and it's a DSP4 switch setup.

 

Which of the HP tunes on your dsp4 do you like the most and what HP tune gets you the best Highway economy? How do you like Great Whote North?

 

This was after coming off the interstate on the way back from the beach. Cruise was set at 75-77 the entire trip. Gets around 26 around town. Hand calculated the dash is about +/-.2.


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These numbers everyone is posting are meaningless. My best is 37 MPGs but my truck averages 24 MPGs when hand calculated at every fill up. I know a 4x4 truck with a 3” lift and tow mirrors can’t get 37 MPGs.

 

My truck is really liking the move to Oregon as well. 😎

 

Here is my Fuelly log