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I own an 06 4.7L durango. despite what alot of people say the 4.7 gets better gas milage in the city because MDS only kicks in really on the highway. I love my 4.7 it has plenty of power to tower a boat or other medium loads and the gas milage is around 3mpg better depending on how you drive. it just depends what you want to do with it. The 4.7 still has plenty of torque to tow, you dont need all the horsepower of the 5.9
What year does the Hemi have the MDS? I've seen a few 5.7's now, but there is no mention anywhere of any MDS system on them. They where 2007's and 2008's.
Do Durango's from California have any extra emissions stuff that I might not like? I know on 2nd Gen Rams, Cali trucks had extra o2 sensors and 2 cats. Just wondering.