2020 AT4 6.2 Road trip MPG and vehicle ride

[calgator73]

Truck

2020 AT4 CarbonPro (shortbed) with a 6.2 and dealer installed GM catback/cold air intake w/calibration riding on 20s with trail runners.  Tire pressure increased to 38 for lower rolling resistance.

 

Started the trip with 3500 miles on the clock and took a 1582 mile mostly interstate trip and here are my MPGs

20.4

19.5

18.0

19.0

 

Just a perfect ride over most surfaces.  A combination of poor concrete slab alignment and potholes seemed to get the truck moderately unsettled at 75 mph but never to the point of the nannies kicking in or me reaching for the brake pedal.  

 

As expected the MPG matched EPA at 75 mph.  One tank mostly at 82 netted 18mpg.  Actual 25 mile average at that speed was 17.5. 

 

Adaptive cruise is really good and it definitely reinforces good habits as it will try to decrease speed well in advance of where I normally initiate a pass.

 

Power is instantaneous  at any speed up to the limiter.

 

Was kind of worried as I had the valve spring issue at 197 miles....but it functioned well this trip.

 

 

[cltsig]

Curious....what tires are "trail runners"?  

[MaverickZ71]

7 minutes ago, cltsig said:

Curious....what tires are "trail runners"?  

Google is your friend.

Goodyear Wrangler TrailRunner AT tires.

[cltsig]

He could have said "Goodyear Trail Runners" instead of lower case "trail runners",  to me implying mud tires or something along those lines.  I have the exact same tires on my AT4 CP 6.2 and tires make the biggest difference in mileage, so I was keenly interested in exactly what "trail runners" meant.  I had no clue they were called "Trailer Runners" nor do I give a damn, only knew they were Goodyear Wranglers.

[Teutonics]

On a round trip ATL-->NOLA-->ATL in my 2018 w/ 6.2L w/ 4wd loaded with 4 people and luggage (three girls, so LOTS of luggage, LOL!) I averaged 25.5mpg for the entire round trip.  Speed was around 75mph, tires are the stock 22" Bridgestone Duellers at 35psi. 

 

Granted that's a fairly "flat" drive most of the way, but I was stunned that you could get that kind of mileage out of a 420HP 6.2L 4x4!

Edited March 8, 2021 by Teutonics

[It's Tim]

The average of 6 tankfuls is usually used to calculate fuel mileage. Cherry picking data always skews the results.

[calgator73]

On 3/8/2021 at 12:31 PM, cltsig said:

He could have said "Goodyear Trail Runners" instead of lower case "trail runners",  to me implying mud tires or something along those lines.  I have the exact same tires on my AT4 CP 6.2 and tires make the biggest difference in mileage, so I was keenly interested in exactly what "trail runners" meant.  I had no clue they were called "Trailer Runners" nor do I give a damn, only knew they were Goodyear Wranglers.

Sorry about that...made the incorrect assumption that people generally know what they have and if my comments apply to them.   Best of luck.

[calgator73]

On 3/8/2021 at 1:48 PM, Teutonics said:

On a round trip ATL-->NOLA-->ATL in my 2018 w/ 6.2L w/ 4wd loaded with 4 people and luggage (three girls, so LOTS of luggage, LOL!) I averaged 25.5mpg for the entire round trip.  Speed was around 75mph, tires are the stock 22" Bridgestone Duellers at 35psi. 

 

Granted that's a fairly "flat" drive most of the way, but I was stunned that you could get that kind of mileage out of a 420HP 6.2L 4x4!

Guy out here in OKC with me has a 2019 AT4 6.2 with 18" dura tracs and makes the same claims....gotta call BS on him unless he's drafting.  For you...that might not be unreasonable.  Doesn't look like you're lifted and likely running all seasons.  Thanks for sharing.

[Transient]

Guy out here in OKC with me has a 2019 AT4 6.2 with 18" dura tracs and makes the same claims....gotta call BS on him unless he's drafting.  For you...that might not be unreasonable.  Doesn't look like you're lifted and likely running all seasons.  Thanks for sharing.

2020 Trail Boss LT 6.2 w/ GM CAI and Performance Exhaust, and stock 18" Duratracs. Started in Norfolk, VA and ended in San Diego, CA. To I-64 to I-85; to I-40 across NC and TN, into AR; then dropped south to Natchitoches, LA; then back roads to interstate to San Antonio, TX; more back roads to Roswell, NM and then north to I-40; to Flagstaff, AZ and Grand Canyon south rim; north to Grand Canyon north rim; to Mesquite, NV via bank roads to St George, UT and I-15 south; finally down I-15/I-215 to San Diego, CA, and was north of 20 mpg all the time. I was point, and my wife followed in her 2017 Traverse. We need fuel stops at the same time every time. My cruise control was set between 4+ to 8+ over the posted speed limit. Best 50 mile mpg was 23.9 and 25 more mpg is 33.X. don't remember to 400 mile mpg, but it is north of 20. No drafting going on. These trucks with the 6.2 are returning better mpg than estimated by the EPA.

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[calgator73]

59 minutes ago, Transient said:

2020 Trail Boss LT 6.2 w/ GM CAI and Performance Exhaust, and stock 18" Duratracs. Started in Norfolk, VA and ended in San Diego, CA. To I-64 to I-85; to I-40 across NC and TN, into AR; then dropped south to Natchitoches, LA; then back roads to interstate to San Antonio, TX; more back roads to Roswell, NM and then north to I-40; to Flagstaff, AZ and Grand Canyon south rim; north to Grand Canyon north rim; to Mesquite, NV via bank roads to St George, UT and I-15 south; finally down I-15/I-215 to San Diego, CA, and was north of 20 mpg all the time. I was point, and my wife followed in her 2017 Traverse. We need fuel stops at the same time every time. My cruise control was set between 4+ to 8+ over the posted speed limit. Best 50 mile mpg was 23.9 and 25 more mpg is 33.X. don't remember to 400 mile mpg, but it is north of 20. No drafting going on. These trucks with the 6.2 are returning better mpg than estimated by the EPA.

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I checked my 25/50/400 this morning and it was 24.9/23.1/20.1 respectively.  They do well just shocked at some of the claimed numbers

[KARNUT]

My experience with trucks, cars, SUVs and traveling is a little less air pressure for a smoother ride. With trucks instead of setting the cruise at 74. I usually ran 72. That usually made up for the less air pressure. My last truck I used as a trip vehicle was a 2014 GMC. 5.3-342 gear V-4 delete. I routinely had over 20 MPGs, usually around 22. A detour off 95 north near Columbia on to 17 @ 60MPH got me 24MPG. The softer (less air) made for a smooth ride. I follow the same (less air) in my other rides too.


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