If GM thought they could get away with putting the 6.2 in an HD they would have done it already. While the 6.0 continues to hold it's own and in some tests even outperform the more powerful offerings from RAM and FORD, it kills them in the ad wars to be underpowered on paper in comparison. The 6.2 gets great mileage for the power level and runs as well as the spec sheet says it should. I am happy with my second 6.0, especially with the 4.10's, even the mileage is not bad, but I would be way more happy with 460 hp/450 ft and a solid 18 mpg at 75 mph.
