we have an '05 grand with the V6.. only issue we had was the switch under shifter to let you shift manually had to be replaced.
It is my wifes car.. she gets around 15 to 16 in town and we usually get 22 to 24 on longer highway triops, like when we go to FLorida.
V6 has plenty of power unless you want that seat of the pants feeling..
I have taken it on the beach and it did better then some true 4x4.. I have also towed some light stuff (pop up camper) with no issues..
I am very pleased with this Jeep.