2014+ Gas Mileage (MPG) Topic

[Sierra Dan]

All of you 6.2 owners will have a 3.23 rear ratio unless you have the max tow gearing at 3.42.

Seems like a bit of a difference between MGS on a 3.23 rear and 3.42.

I have the 5.3  3.42 and my average is only around 17-18

Best highway I have seen is 23. But no way do I average 20-21 even babying it trying to keep things in V4

[Roscopcoletrain]

best Ive gotten is 24.7 according to computer. 

average in the 19-21 range depending. 

at one point towing the trailer it was in the 7s 

[DirtyAndy]

All of you 6.2 owners will have a 3.23 rear ratio unless you have the max tow gearing at 3.42.
Seems like a bit of a difference between MGS on a 3.23 rear and 3.42.
I have the 5.3  3.42 and my average is only around 17-18
Best highway I have seen is 23. But no way do I average 20-21 even babying it trying to keep things in V4

Change tires? I’m still on the stock Goodyear LS2’s.

[TXGREEK]

All of you 6.2 owners will have a 3.23 rear ratio unless you have the max tow gearing at 3.42.
Seems like a bit of a difference between MGS on a 3.23 rear and 3.42.
I have the 5.3  3.42 and my average is only around 17-18
Best highway I have seen is 23. But no way do I average 20-21 even babying it trying to keep things in V4

My 14 5.3 with the 3:42 got tops 20mpg highway which was standard and was horrible while towing a 7K# trailer got me at best 5mpgs and absolutely sucked on fuel mpg’s too and it too had same as yours but you know I’ve seen lots of people rave about their 5.3’s with the 3:42 rear end getting mid 20’s on mpg. I didn’t think about it when I ordered my 18 6.2, but I still think it’s the engine. Less push to go, lots more power and torque just holds much better


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[Sierra Dan]

I do not tow alot.

The 3.42 shines most on the highway in hilly terrain here in Mo.

Not as much downshifting.

[Grumpy Bear]

1 hour ago, Sierra Dan said:

I do not tow alot.

The 3.42 shines most on the highway in hilly terrain here in Mo.

Not as much downshifting.

Now that is useful information. Thanks Dan! 

[Roscopcoletrain]

10 hours ago, Sierra Dan said:

I do not tow alot.

The 3.42 shines most on the highway in hilly terrain here in Mo.

Not as much downshifting.

I just wished it'd drop a gear here and there so it doesn't lug so much.

[Sierra Dan]

10 hours ago, Grumpy Bear said:

Now that is useful information. Thanks Dan! 

Well thank you Marty!

Back when I was in Scouts...….  our summer camp used to announce "Useless Information for the Day" every day at breakfast.

Sometimes I cannot seem to break this habit LOL 

 

[906Chevy]

I've been a long time lurker here, but I just want to post my fuel mileage situation.

Vehicle: 2014 Silverado LT 5.3, 3.08 gear ratio, 2.5" level, 32" tires.

Mileage: I bought the truck at ~30k miles, I was getting an average of 16.5 mpg up in Alaska on winter blend fuel, moved down to FL and now I'm getting at best 13.5 mpg with mid grade and as low as 11.5 with E85. I do 50 miles highway and about 3 miles city every day and I drive very conservatively.

 

I didn't buy the truck for its fuel economy, but something seems off.

[elchilero53]

On 9/13/2018 at 8:37 AM, Sierra Dan said:

All of you 6.2 owners will have a 3.23 rear ratio unless you have the max tow gearing at 3.42.

Seems like a bit of a difference between MGS on a 3.23 rear and 3.42.

I have the 5.3  3.42 and my average is only around 17-18

Best highway I have seen is 23. But no way do I average 20-21 even babying it trying to keep things in V4

That is about what I am getting with the 6.2 and 3.23 rear as an overall, lifetime average.  I am getting 17.6 mpg at 25,100 miles and that includes towing a trailer for 5,000+ miles of that at 10 - 12 mpg.  Typical highway mileage is 20 - 21 mpg and around town is 15 - 16 mpg.  I am happy with that performance.  I got similar mileage numbers with my 2014 Tahoe with a 5.3L, 6-speed and 3.42 rear except my around town mileage was 14 - 15 mpg; my lifetime average (69,000 miles) was 16.9 mpg (including towing about 7,000 miles at 8 - 9 mpg).  So those numbers are definitely not out of line.

Edited September 15, 2018 by elchilero53

[Sierra Dan]

Your numbers are good Bob.

It seems there is a big difference between mpg with a 3.42 gear vs 3.23

At this point i would rather have the 3.23

[DONWT15]

9 hours ago, Sierra Dan said:

Your numbers are good Bob.

It seems there is a big difference between mpg with a 3.42 gear vs 3.23

At this point i would rather have the 3.23

I have the 3.42 gears and overall pretty satisfied. Usually check MPG's on runs up to our camp approx 75 miles from home. 8 miles at average of 40 mph, then 57 miles on the interstate with cruise set at 70, then another 7 miles on back roads around 45-50.

If I'm running with nothing loaded it gets 15 mpg, 20.5, and back to 15 again. About 17-18 average for the trip.

If running loaded: groceries, utility trailer with a John Deere lawn tractor, weed eater, gas, and any tools I might need (2200 lbs towed), and 2 adults it drops 1-1.5 mpg to 16-16.5 for the trip.

Quite happy with this. It's 3 mpg better than the F-150 with the 5.4L and 3.55 gears I traded in.

Not sure if there would be any benefit going to the 3.23 in my case IMHO. 

[Snoringbear]

On 9/14/2018 at 6:26 AM, Roscopcoletrain said:

I just wished it'd drop a gear here and there so it doesn't lug so much.

Try driving in tow-mode and see if that helps.  Tow-mode holds the gears till a higher rpm is reached before shifting than when in normal-mode.  It’s much the same logic used for sports-mode in performance cars.  Anyway, give it a go.

[elchilero53]

On 9/14/2018 at 7:52 PM, Sierra Dan said:

Your numbers are good Bob.

It seems there is a big difference between mpg with a 3.42 gear vs 3.23

At this point i would rather have the 3.23

With the 3.23, you lose tow rating but gain mileage.  It tows just fine as long as you don't get over about 7600 lbs of tow GVWR.  Mine is rated to 9,100 lbs (it's a Z71 4x4, so some reduction overall).  For what I will tow now and in the future, this is just fine.  Plus I use it as a commuter so it is a compromise.  If I want to tow a big trailer or a 5er, I will buy a 3500 Duramax anyway.

 

I think the big difference is between the 6-speed and 8-speed tranny.  If my old Tahoe had the 8-speed, I would have seen better mileage overall and a better tow rating.

Edited September 16, 2018 by elchilero53

[Harry-Nips]

I have a 2014 6.2L with the 3.73 rear end (Max Tow) and I've averaged 12.7 L/100 km (18.5 US MPG) over the lifetime of the vehicle. A lot of that is highway driving but some of that is towing also, with winter fuel a lot of the year. I never put 87 or 89 in it, and overall quite happy with the vehicle. I highly recommend the 6.2L engine, it was the main reason I swapped from a 2500 since I didn't want a diesel.