One note about the Dodge Pentastar: As far as I saw, it is a common rail ignition system. Pretty much, turbo or no turbo, it is able to squirt the optimal mixture into the cylinder. Chevy does similar with the VVT (variable valve timing.)
This is one of the reasons why the van gets such decent MPG. Older engines have been upfitted and improved (such as the 5.4 and the Ford V-10 with cam phasors), but this is a ground-up rebuild.
The engine/transaxle engineering is also interesting. Long term, it would be great if Fiat/Dodge can get the AMT (automated manual transmission) technology shifting as well as a hydraulic transmission, because it would improve fuel economy even further.