ksss wrote:
The 6.0 is the oldest gas engine in a HD on the market. Ironically it appears to me that the newest engines while slightly more powerful, have not improved in MPG either. The Ford 6.2 is no better than the 6.0 gm in mpg and its a near new design. The Ram 6.4 is the newest engine on the market, we will see what it gets for mileage, but I will bet it does not better than the 6.0 or 6.2.
IIRC the 6.4 Hemi has the deactivation setup. Runs on less cylinders when needed. Not sure if that will translate into better mpgs or not, but in other motors it did.