[der Geist]

I have an '03 2.7 as well and it gets pretty good milage. After the chip tune I marked an average of 32 MPG on the highway. When I am not on trhe highway I usually get in the high teens. You should check your air filter 1st thing, then your plugs as djomlas pointed out. Your plugs should be a nice tobacco brown. Do you know what the service record is like with this car? Since you just bought it I would be highly suspect of the past serviceing even being done let alone being done properly. Your problems can probably be diagnosed pretty easily by a qualified mechanic. Pull out that air filter and give it a firm tap. If it's loaded with dust your choking your air supply.