2020 GMC Sierra 3.0 MPG Update

[Sierra 3.0]

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

 

[redwngr]

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]

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.

[Mercracing]

Following this one! Picking up my 3.0 Wednesday and can’t wait for the great fuel mileage!


Sent from my iPhone using Tapatalk

[mjonesjr84]

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.

[Jcollette33]

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

[Stranny]

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]

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.

[redwngr]

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]

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]

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 January 27, 2021 by newdude

[mjonesjr84]

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]

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]

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

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

[Crazypontiac03]

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.