2015 Chevy 2500HD 6.0L gas Ike Gauntlet

There should be separate sets of testing. Let the truck make the decisions for one(for the people that want to be hands-off), then force the best shift sequence in another. On cruise, my 6.2 will hold a gear until it loses exactly 3mph before it downshifts. By that time, it usually takes 2 gears lower to make up the lost ground when it could easily get by with 1 gear lower. It will hold 2mph below the setpoint for a mile without downshifting, which I don't mind. I understand it is desirable to hold a gear if it's nearly maintaining speed but they could do a better job of tuning the "D" parameters in the controls to handle varible grades. Maybe they are carrying over tuning from the 6.7 and isn't optimized for the gas version.

I guess my 2nd point is that they should have constant speed tests on cruise in hilly terrain. If you want to set it and forget it, how well does it hold 60mph.