Hi Dave & Sherri,
Long time Ram owner here (4 Rams and a Dakota). We just traded in our 3.6L V-6 Pentastar for the new Eco Diesel 3.0L V-6 Turbo. Last summer we pulled a smaller 3500 lb Cobblestone around the country (8,265 miles) and averaged 14.3 mpg with about 250 miles sight seeing with no TT. We pretty much took small backroads and avoided Interstates so really took her easy. We loved the V-6 gasser but it was 2WD and wouldn't pull our new FF 214WSD up our steep driveway in the wet. Needless to say, we opted for the 4WD with "anti-slip" rear axle as Ram calls it with the Eco. We have another 8,000 miles planned for 2015 as well. The Pentastar dropped to about 12.5 mpg with the new FF 214. It makes almost as much HP as our previous 2010 4.7L V-8 (minus 9 HP) but only produces about 65% as much torque at 1,000 rpm higher so we really like the 420 lbs ft at 2,000 rpm from the diesel.
Check out the links below
Neil & Yoly