Given the MY2012 JGC 5.7L rating of:
And the following note about the predicted fuel economy change in the Dodge lineup:
Also available on the 2013 Ram is a 5.7-liter Hemi V8. Output has been nudged from 390 to 395 hp, while torque remains at 407 lb-ft. When mated with the TorqueFlite 8 transmission, the 2013 Ram with the Hemi V8 also will get at least 20 percent better mileage than its predecessor, according to Chrysler, thanks in part to the use of cylinder deactivation, stop-start technology and other fuel-efficiency advances.
I compute the following estimate for the MY2014 JGC w/5.7L v8 and 8 speed:
21.67 "combined" (calculation source