2014+ Gas Mileage (MPG) Topic

elchilero53 · July 23, 2018

10 hours ago, ftwhite said:

Trip from Redmond, WA to Redmond, OR. Averaged just over 20mpg over the whole trip. Good flat spots got 25mpg. Mt. Hood and Santiam pass cost some serious gas at about 14mpg.

Nice! That's what I have been getting and am still getting at 23,800 miles! What's not to like?

Jacoby · July 24, 2018

On ‎7‎/‎21‎/‎2018 at 9:48 AM, elchilero53 said:

You might should find out what the gearing in the drive train is. I sounds like you bought an off-road truck geared for steep grades, sandy/boggy areas and impressing chicks rather than commuting and driving around town. New tires probably won't help much at all.

Its a 3.42 gear and I disagree. I think tires would help quite a bit

gtbigup01 · July 26, 2018

397 mile road trip from TN to GA @ 72 mph on Cruise control, 5.3 CC 4x4 Sierra. Got close to my destination and decided to fillup. put 16.1 gal in which manual calculations worked out to be 24.2. Close enough to the computer for me and impressed for a truck. Probably could get better but lost of mountainous roads during my trip.

EDL · August 5, 2018

I put a cheapy soft tonneau cover on the 2018 and Friday the wife and my daughter and I hit the road from western PA to Columbus, OH to pick up my son at the airport, we then headed north up near Sandusky and then came home last night (600ish miles round trip). I don't have a pic of the DIC yet, but we were steadily running 27+ MPG and at one point even hit 28.5. It helps that Ohio is mostly flat, but even arriving home last night after getting back in the hills in PA, parked the truck at 27.1MPG.

I'm pretty impressed the 6.2 can turn these kinds of numbers. I think the tonneau cover helps some with the aerodynamics.

Now I just have a sh*t ton of bugs to get cleaned off the front and give her a good wash.

Fishtail8 · August 5, 2018

I put a cheapy soft tonneau cover on the 2018 and Friday the wife and my daughter and I hit the road from western PA to Columbus, OH to pick up my son at the airport, we then headed north up near Sandusky and then came home last night (600ish miles round trip). I don't have a pic of the DIC yet, but we were steadily running 27+ MPG and at one point even hit 28.5. It helps that Ohio is mostly flat, but even arriving home last night after getting back in the hills in PA, parked the truck at 27.1MPG.

I'm pretty impressed the 6.2 can turn these kinds of numbers. I think the tonneau cover helps some with the aerodynamics.

Now I just have a sh*t ton of bugs to get cleaned off the front and give her a good wash.

Agreed, 6.2's can get amazing mileage for what they are if you can keep your foot out of it for a trip. Better get a tonneau on mine soon.

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Enough · August 5, 2018

Jacoby, I'm surprised you can get 13.4 MPG with a 7" lift, 35" tires and 3.42 gears. That's great considering the alterations to your truck !

I'm 2 WD running stock Bridgestone 255 17's with 3.42 gears and 5.3. At 34,000 miles my lifetime MPG is 21.4.

Envious of the 23-25 MPG some of the guys here are getting, but I don't baby mine at all and love the power I have between 30 and 70.

Badcummins59 · August 6, 2018

Hey guys. I have a '14 all terrain 5.3 with tow package, 305x55-20 and 2" leveling kit and I see 13mpg all day long. Its frustrating because I expected more. 33k miles. It's a Canadian truck. Oil pressure is in kpa and coolant is in *c. Has no other mods. Thinking about taking the 2" spacer out and going 5100's with 275's

elchilero53 · August 8, 2018

On 8/5/2018 at 9:47 AM, Fishtail8 said:

Agreed, 6.2's can get amazing mileage for what they are if you can keep your foot out of it for a trip. Better get a tonneau on mine soon.

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I put a hard, quad-fold tonneau cover on my Silverado and then put light-truck tires on. Mileage held at 20-22 mpg highway and 15-17 around town. The towing characteristics are what really changed significantly. The tow is easier and more stable with much reduced shimmying and tail-wagging. The best mileage I have ever gotten was 34.3 mpg running at 45 - 50 mph with a light foot down some of the local backroads around here. What's not to like!

goeb34 · August 16, 2018

I have a 2014 silverado v8 5.3 leveled on 35's with a tune on it, true dual straight pipes with cats, and I get around 17-18 highway cruising about 70 mph, and around 12-15 city depending on how much i put my foot on it and feel like speeding or hearing my exhaust.

Something i can sorta relate to except 33s and a 6.2

snoodcrusher · September 1, 2018

2018 double cab Midnight Edition with factory Dura tracs, got 19.8 mpg. Installed 2" level, upper control arms, MBRP stainless exhaust, and tuned out the V4 mode with a Diablosport i3 and now I get 20.3 mpg. All mods done at the same time so I would think that my new mpg would be even better without the negative aerodynamics caused by the level kit. But, the drivability sucked so bad before the tune and V4 delete that I'd be happy with 15 mpg to have a truck the drives like it does now. It's a 100% improvement, like a totally different truck. My new 20.3 mpg is outstanding considering I run the piss out of it to hear the exhaust!

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CharlestonJoe · September 1, 2018

What engine do you have Snoodcrusher?

snoodcrusher · September 1, 2018

I have a 5.3

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DirtyAndy · September 9, 2018

Only had the truck for a little over a week, but my 2018 Crew Cab with 5.3 4x4 is averaging 21.4 with my best being 22.4 (both numbers recorded from the last 400 miles). I ain’t complaining about that at all. My 2008 Sierra got 15 no matter how I drove it.

So far, I’m happy with that 8 speed trans.

Centex14 · September 9, 2018

15.5-16.5 all day every day. Tune and delete the v4 stuff and it’s still the same. Leveled it’s still the same. I’d imagine once I go to bigger tires and wheels it’ll drop but who knows.

2014 z71 LTZ
Volant Intake
Borla Exhaust
Diablo
Bilstein 5100
Rough Country Level

MN1(SW) · September 10, 2018

I've got E rated 285/70 17's w/steel wheels on my 2015 K1500 with a 5.3 and a soft tonneau cover. I also had BBP tune it for me. With AFM off and cruising from San Diego to MS at around 85mph, I was averaging 21mpgs. I probably could've gotten better if I set C/C lower but "I had a long way to go and a short time to get there."