CONFESSION - I do not have a Trail Boss or the big tires. No lift either. But my DIC shows gas mileage pretty much right on with my calculations. I've recorded every drop of gas for 5,353 miles and my average calculated mileage has been 18.6. The average of the numbers from the DIC on each tank full is 18.8. Below are screen shots of my best trip and my best 50 miles. My truck has the 3.42 gears, 18" wheels, stock tires. I use 10% ethanol 92 octane premium Chevron (winter blend, probably, on this trip). Temp was in the mid- to hi-40s, not much wind or precipitation. Up-and-down terrain but elevation changes from sea level to about 1,000 feet. It was about half interstate (60 to 65 mph) and half state highways through the Coast Range mountains (45 to 60) and a few little towns to go slow through (20 to 35). 6.2 and 10-speed FTW!
I liked the look of the 20s on my last truck but I felt like they hurt the ride. My new one has the standard 18s and even with the Max Towing suspension I like the ride a lot better. Ya pays your money and you takes your choice ...
I loved my 2011 6.2 with six speed, and my 2019 6.2 with 10-speed is WAY better (power, responsiveness, smoothness, gas mileage). In between those two I had a 5.3 with 8 speed that I hated. My 6.2 gets better mileage, is smoother and is tons more fun to drive than the 5.3. Door Number Two!
Some good points, ShamrockShooter. My truck has the 3.42 gears, 18" wheels with 265/65R18 tires, 35 lb in all four tires. I use 10% ethanol 92 octane premium Chevron gas (winter blend, I assume, on this trip). Temp was in the mid- to hi-40s, not much wind or precipitation. Up-and-down terrain but not any huge elevation changes (less than 1,000 feet). "Your mileage may vary."
I'm blown away by the responsive feel of the 6.2 in the 2019, compared to my '11 6.2 (tuned) and '18 5.3. I don't feel or hear the DFM changes at all and there doesn't seem to be any lag time when I get into the throttle suddenly. Mileage is outstanding. Photos below are the DIC on a recent 250 mile trip; about half interstate (60 to 65 mph) and half state highways through the Coast Range mountains (45 to 60) and a few little towns to go slow through (20 to 35). I've been recording all my gas use in stupid detail, and the DIC guesstimate on mileage is running right at 1.5 percent high compared to 3000+ miles of my gas purchase records.
"Different strokes ...." I almost bought an end-of-year deal on a 2018 High Country but the interior didn't seem any different at all than the 2018 LT I was trading in. I hated the LT's front bench seat and lack of other comforts and conveniences, and the HC didn't impress at all. So after a bit I traded the 2018 LT in on a 2019 LTZ and I think the interior in this one is much nicer than either of the 2018s. I only have 500 miles on the '19 but so far nothing to criticize at all, and I'm enjoying figuring out all the bells & whistles. The styling of the body on the '19 strikes me a kinda odd on the sides, but I really like the looks of the front end and rear end. Of course, the 6.2 and 10-speed are WAY better than the 5.3 and 8-speed - no comparison.
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