2019 GMC SLT 4x4 crew cab 5.3 MPG.

[Welder2014]

New truck to me just over a week old. Returned from a 260 mile trip today right on 24 miles per gallon hwy driving some mixed city. Really happy with this truck much improvement over my old 2014 5.3 extended cab. 

[HondaHawkGT]

I find that 24 MPG is pretty typical with the new DFM 5.3 trucks. I keep it down around 55-60 MPH on some of my local county highways and I've averaged over 25 MPG and even hit 28 MPG on one particularly flat highway. I hope DFM turns out to be a reliable system in the long run because I'm impressed with how smooth and fuel efficient it is.

[econometrics]

I’ve driven 4200 miles in my 5.3L / 8spd RST, and I’m averaging 16.5mpg total. That’s 80% 30-45mph stoplight driving. I’m very impressed with that. My 2007 1500 was usually 12-13 avg. 

 

On hwy trips, I’ve been getting 20-22mpg doing 70-75mph. Excellent. 

[Wmoor004]

Do you regret not getting the 6.2L?

[Welder2014]

38 minutes ago, Wmoor004 said:

Do you regret not getting the 6.2L?

No did not need the extra power. Just got to say that these trucks are really a great value.

[Wmoor004]

2 minutes ago, Welder2014 said:

No did not need the extra power. Just got to say that these trucks are really a great value.

Thank you.  

 

[Wiggums]

Geez, I thought you said 5.3 MPG and I was shocked!

[DBRE]

I believe that my 6.2 does a better job on fuel economy than the average 5.3. . The 10 speed sure helps, With reasonable highway driving I can manage 26 to 27 daily. I have never towed with it . It does have ample power and when the pedal hits the firewall it goes.My 2016 6.2 was no where as quick as this truck but it still got good mileage. 

[MacLaren]

Crew Cab LT Z71, 1850 miles total average is dang near 19mpg and on the 800 miles trip was almost 21mpg.