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2020 GMC Sierra 3.0 MPG Update

Sierra 3.0
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Sierra 3.0 Enthusiast

Sierra 3.0

Posted
Posted

I have been keeping track of almost all fill ups with my 3.0 Duramax and hand calculating the mileage.  I currently have just over 19,000 miles and wanted to post an update.  So far for my total average mileage with mixed driving (city, highway-Non-Towing) I am getting 24.91 MPG.  I have also had no issues with the truck.  I have towed with the truck and forgot to record some fill ups in case you see the discrepancy of miles on the truck VS total trip mileage.  

 

Date Gallons Diesel Trip Mileage MPG Truck Computer
April 28th 18.768 436.1 23.24 22.1
May 5th 20.674 492.7 23.83 22.7
May 15th 17.823 470.3 26.39 24.8
May 24th 19.409 472.9 24.36 23.6
June 2nd 20.547 537.1 26.14 25.1
June 19th 19.532 509.8 26.10 25.5
Jul 1st 19.199 456.4 23.77 22.5
July 8th 21.077 527.2 25.01 23.6
July 12th 13.174 322.2 24.46 23.3
July 16th 21.305 459.4 21.56 20.6
July 24th 22.092 543 24.58 23.30
July 29th 21.294 535.6 25.15 23.8
Aug 14th 19.829 455.8 22.99 22.5
Aug 28th 20.917 481 23.00 21.7
Sep 11th 19.505 476.1 24.41 23.6
Sep 20th 20.909 506.7 24.23 23.5
Sep 28th 19.446 512.2 26.34 25
Oct 14th 21.933 583.8 26.62 26
Oct 20th 21.162 588 27.79 26.8
Oct 31st 20.059 495.3 24.69 24.3
Nov 8th 21.805 550.6 25.25 24.6
Nov 16th 20.981 554.8 26.44 25.9
Nov 21st 14.668 380.7 25.95 25
Nov 25th 21.815 550.3 25.23 25.4
Dec 1st 22.846 576.5 25.23 24.8
Dec 18th 20.696 506.5 24.47 23.8
Dec 28th 20.659 533.1 25.80 25
Jan 21st 22.342 544.3 24.36 23.9
Totals 564.466 14058.4 24.91 24.025

 

  • Like 1
redwngr Senior Enthusiast

redwngr

Posted
Posted

Similar results with this one. (but only about 1/10th of the miles so far)

Every fill-up has given 24.xx mpg. 

Hand calcs show a little better than the truck computer. 

 

 

blckblt Enthusiast

blckblt

Posted
Posted

That is amazing.

 

How much of your mix is city?

 

Outside temps?

 

Highway speed?

 

Do you let it idle much (either to warm up in the cold or to cool the cabin in the summer)?  I have to let my vehicles warm up (idle) for 2-5 min in cold/winter for the wife (easier to spend more on fuel then to listen to her complain).

 

I have an AT4 with the 3.0 on order, hopefully it will ship soon.

 

The mileage is one of the reasons for me ordering the 3.0.

mjonesjr84 Enthusiast

mjonesjr84

Posted
Posted

It is fun having data like this. I've got a screen shot of every fill up hand calculation since I got the truck on 10/21/2020. My average fuel mileage is 26.493 mpg with the lowest being 23.983 mpg and the highest being 29.349 mpg.

 

I'm amazed how a 1/2 ton pickup can get better mileage than my wife's 2020 Equinox with the 2.0T engine.

  • Like 2
Stranny Enthusiast

Stranny

Posted
Posted

Mine too, at least more than I expected. A buddy of mine that has the Ram 3.0 I asked him if he noticed less than normal and he said yes. So I think it is just the diesel blend around here for the winter.

mjonesjr84 Enthusiast

mjonesjr84

Posted
Posted

I haven't seen a drop so maybe I've only been using winter blend since I got the truck. If that's the case, I can't wait to see what the mileage is when summer blend gets back to the pumps.

  • Like 1
redwngr Senior Enthusiast

redwngr

Posted
Posted
2 hours ago, Jcollette33 said:

My mileage has really dropped of with the winter blend this year. Has was anyone else noticed that?

I've found it to be any every year thing.  

 

 

 

ArrowsmithPML Enthusiast

ArrowsmithPML

Posted
Posted
3 hours ago, Jcollette33 said:

My mileage has really dropped of with the winter blend this year. Has was anyone else noticed that?

Yes.
Summer #2 is good to -7C where it starts to cloud. Winter is a mix of #1 and #2 or start up #1 depending on where you are (how cold and how north) and it clouds at around -40C. The mileage varies about 5 to 20% and is also impacted by running heavier weighted oils (15W/30 vs 5W/40) for example.

Cheers,

 

‍

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
7 hours ago, mjonesjr84 said:

It is fun having data like this. I've got a screen shot of every fill up hand calculation since I got the truck on 10/21/2020. My average fuel mileage is 26.493 mpg with the lowest being 23.983 mpg and the highest being 29.349 mpg.

 

I'm amazed how a 1/2 ton pickup can get better mileage than my wife's 2020 Equinox with the 2.0T engine.

 

 

Not to stray topic but on your 2.0T, do you run 91/93 in it (GM recommended) or 87?  We had a rental 2.0T that we put 500 miles on driving from Rochester NY to Cleveland OH and back.  On the way down, the tank had 87 in it.  We got just about 24.5mpg down (including some back and forth home about 30 miles) and burned the whole tank.  I filled it with 93 in Ohio, we drove around there about 20-30 miles during our stay then drove back and got 29mpg with 93 in the tank and had fuel to spare (90-100 miles of range).  Majority of the driving was highway/thruway doing 65-80mph.       

Edited by newdude
mjonesjr84 Enthusiast

mjonesjr84

Posted
Posted
3 hours ago, newdude said:

 

 

Not to stray topic but on your 2.0T, do you run 91/93 in it (GM recommended) or 87?  We had a rental 2.0T that we put 500 miles on driving from Rochester NY to Cleveland OH and back.  On the way down, the tank had 87 in it.  We got just about 24.5mpg down (including some back and forth home about 30 miles) and burned the whole tank.  I filled it with 93 in Ohio, we drove around there about 20-30 miles during our stay then drove back and got 29mpg with 93 in the tank and had fuel to spare (90-100 miles of range).  Majority of the driving was highway/thruway doing 65-80mph.       

We've ran 93 octane in it since the full tank of 87 was ran out that the dealer put in it when it was bought. We've never gotten above 22 mpg in it. Granted, it only has 6k miles on it in a year and no trips have been long distance on the highway.

eckseleven Enthusiast

eckseleven

Posted
Posted

Winter fuel where I am (NY) and with about 60% city and the rest highway I'm seeing a best of 18.8. I have only 1300 miles though. Would love to see mid 20s in the summer with the same driving.

Anyone using fuelly? That's where I track mileage. I text my fill up details to them and it gets added to my profile. https://www.fuelly.com/driver/eckseleven

Sent from my Pixel 5 using Tapatalk

redwngr Senior Enthusiast

redwngr

Posted
Posted

I still just write it down in a little book....

...using the same method since the '70's oil crisis....

Crazypontiac03 Enthusiast

Crazypontiac03

Posted
Posted
On 1/27/2021 at 11:26 AM, Jcollette33 said:

My mileage has really dropped of with the winter blend this year. Has was anyone else noticed that?

Yep, I’m located in Northern IL. Between more idle time and winter blend, my avg is down to about 21.5. Down from an avg of 24.5 with a mix of city/rural driving. 

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