Having owned a 2004 Explorer, the 2006 changes proved to be a step backward. Changes to the interior door handles are not intuitive, the dash is busy, I've counted as many as 20 separate plastic pieces. The change in the tailgate from the split tailgate to the liftglass makes it much more difficult to load anything without opening the entire tailgate. The movement of the shift lever from the column to the floor eliminated a lot of storage space. The gas mileage on my 4.0L 2004 consistently ran 20 - 21 mpg in highway driving. So far the 2006 is giving me 17 - 17.5. I hope this improves with added mileage. All in all a disappointment.
Actually I'm not very impressed with the 2006 changes. I feel the 2002 - 2005 models were laid out much better.
Change the interior door handles to something ergonomic. Replace the "split" tailgate, and eliminate the lift glass. Put the shifter back on the column, and replace the storage in the center console.