2008 Grand Caravan SXT Gas Mileage

Hi Folks:

Wife bought the '08 SXT but is concerned about the gas mileage. It's only 
getting around 14 mpg in local driving and around 19 with mostly highway 
driving. The car it replaced was a '96 Grand Caravan with the same size 
engine (3.3L) and that got close to 20 local from day 1.

She called the dealer and was told that there was nothing wrong with it or

she'd have gotten a warning light so to just wait for it to break in.
(It's 
got around 600 miles on it now.)

What are others of you with this car getting?

TIA.

- Dave