My Neighbor had a couple of the 6.2's, one in a 3/4 ton, the other in a suburban.
He is a motor head and makes his living with cars.
His main reason for the 6.2's at the time was fuel cost- which is less an advantage it seems, with gas motor getting pretty good mpg- and gas cheaper than diesel.
The other reason ( and don;t tell the kids), is that he didn;t want his teens to drive something that would go 0~60 is under 12 seconds.
While the motors held up well and always performed, It seems like every couple of months the alternator or starter was being replaced. The cost was zero as all the replacements had the autozone warranty, but Mike had to stay on top of this stuff.
These services were so frequent that he put quick disconnects on his batteries.
both of those vehicles are gone now- he is much happier with his 2007 silverado 3/4 ton as a tow vehicle. it gets good fuel economy.
for comparo ,my chev based van with 6.0 gets 15 MPG at 70 ish mph
Mike