All I can say is the number 20, as it pertains to MPG, and Hemi in the same sentence makes me chuckle :)
If the eco-diesel Ram thing can get 20 mpg it has a huge place in the market. Of course, it would have a super-huge place if it had a payload anywhere close to the Ecoboost or other 1/2 tons.
Back to talking about the Hemi, I'm the proud, super happy owner of a 6.4 Hemi and it's a great truck but it's no fuel miser. And from what I hear the 6.4 gets the same or slightly better mpgs than the 5.7
So, basically, a Hemi vs. the eco-diesel is the old cliché - apples and oranges.
