My 6.2 has no problem pulling our fiver up the steeper grades mostly at the speed limit. Comparing a modern 6.2 to a GM 6.0 is apples to oranges and I know I own both. While the 6.0 is a great engine it isnt nearly as capable as the 6.2 . I have also owned a 7.3 and would put the 6.2 as slightly ahead of it capability wise as well. The engine braking is phenomial I hardly have to use the brakes on steep downhills at all they, are stone cold when I get to the bottom. And I have no problem using cruise either.