Anybody have any predictions for the new 2014 2500 6.4 L Hemi MPG...specifically in a Power Wagon model? I've read current owners are getting 15 MPG on the highway. Considering the 6.4 L is larger than the 5.7 L, it may require more fuel...but it will also utilize the MDS, which may make it equivalent in terms of MPG to the current 5.7 L. I'm predicting it is likely the same, if not a little less than the 5.7 L. What is everyone's thoughts of the MDS on 6.4 L? I'm under the impression the the 5.7 L in the 2500s don't utilize the MDS. Is it a reliable system for HD pickups? Thank you.