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Hey guys, let's add a little more clarity to the thread for others who view this in the future. . Engine size, 4x4 or 2wd, the amount of level/ lift, tire type: all terrain, Highway Tire, mud tire, and year. It'd be cool to see how much of a variance there is. Cheers

 

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11 hours ago, 2018GMC said:

I have bilstein 5100 on 3rd notch for 1.75" lift. Nearly 33" (32.8") BFG K02 Tires.

 

I can still pull down 20 - 22 if I drive 65 -68.

 

If i went your speed i'd prob get the same mpg as you.

 

On a 50 mile 2 lane road with cruise set at 58, I averaged 28 mpg.

 

As others have said speed kills mpg when you're driving a brick with the frontal area of a sheet of plywood. 

good info...thanks.  Yeah it just is what it is when making that sort of time.

Edited by Rick Burnham
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13 hours ago, CamGTP said:

88mph would last only a few minutes here, then it would be zero while you're pulled over lol.

no kidding. Texas is a different world.

We don't have any roads with a limit over 70.

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GA has large stretches of most interstates at 70mph, the GeorgiaStatePatrol allow an unspoken 10mph over the limit speed. (i've even passed them going 80/70 while they were closer to 70 without incident).

 

in August 2019, when I first got my 2018 5.3L Z71 crew cab, I got 25.5mpg on the highway (stock configuration).

I drove up through the Appalachian mountains last week and averaged 21-22mpg (10mph over posted limits) after a 2" urethane level kit. (still stock wheels/tires).

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2018 GMC CC SLT Tuned 6.2 w323 Rear End Z71 4X4 Standard Bed, 4.5” CST Lift, 20X9 Fuel Wheels on 33”KO2’s

 

ffa791b422482879b87ed3e7d5565697.plist

 

65 MPH gets average 23 mpg w Super

 

e5d18db3dd7650092f2623ce8caf1042.jpg

 

65 MPH Super mixed with E85 average 20 mpg

 

393922a2daf2fd1d94572300103b8637.jpg

 

 

 

Sent from Above

 

 

 

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2018 GMC CC SLT Tuned 6.2 w323 Rear End Z71 4X4 Standard Bed, 4.5” CST Lift, 20X9 Fuel Wheels on 33”KO2’s
 
ffa791b422482879b87ed3e7d5565697.plist
 
65 MPH gets average 23 mph w Super
 
e5d18db3dd7650092f2623ce8caf1042.jpg
 
65 MPH Super mixed with E85 average 20 mpg
 
393922a2daf2fd1d94572300103b8637.jpg
 
 
 
Sent from Above
 
 
Did you re-gear?

Sent from my LG-G710 using Tapatalk

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I can get up to 19 mpg (truck calculated) if I set the cruise around 70. Speedometer is 3-4 mph off in the 70 mph range because I haven't done a tune. On my daily 25 mile commute, with *several* hard accelerations and cruising 75-80 I usually get about 17-17.5 mpg(Again, Truck Calculated).  

I also haven't bothered to calculate milage by hand because I haven't driven on a long trip in a while to measure gps distance between gas stations.

 

34" x 11" ko2 tires (measures about 33" tall when mounted on the truck)  2.25" Procomp lift.

6.2L, 8 speed transmission, 3.23 gears, magna flow 3.5" muffler welded in place of stock muffler and flapper , drop in air filter, 93 octane

 

Edited by matt_009
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17.2 mpg driving in rush hour traffic on the way to work. 19 on the way home keeping the cruise control set. Probably about 12 miles interstate and 10 miles on back roads 

IMG_6973.jpg

 

IMG_6977.jpg

Edited by matt_009
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