Ksss - I've also read that GM may start using a modified 6.2 in the HD trucks. Even if they do, it initially will be an unproven engine when worked heavy duty. I would hope the new HD engine lineup for GM would be 6.0 for heavy hauling and lighter towing, 6.2 for heavier towing and Duramax for heaviest towing. That the same model Ram is now following with the 5.7 Hemi, 6.4 Hemi and Cummins.
Daveandviv - Your rig is very close to what I'm talking about. I've never had a grade I could not pull at 60mph with the Cummins. I was actually on I-70 outside of Denver and know it will pull it at 60. Doesn't mean I would, because a lot of Colorado passes just can't be pulled that fast. While I would expect 30 mph with the Chevy 6.0 on that grade, I would have expected at least 45 mph on the grades in the eastern US, since the lower altitudes have not taken away quite as much HP as the higher CO passes.
Blofgren - I have researched this. Yes, the newer trucks with SCR do a better job and probably regenerate less than half as much as mine. My retired lifestyle sure fits a gas engine better, so I may just need to compromise my expectations. Considering how little time I'm in the mountains, even going slow would add no more than an hour or so a year to towing time. It would just be a big adjustment from my recent past towing experiences.
Thanks to all. Keep the info coming. Keith
