Hi!
The difference in mileage is because of the different engine. They are both 3.5's but your new one {LZ4}has a de stroked 3.9 and it's a completely different engine then your old LX9. I had a 05 GT before I got this 07 GT and the 05 got much better mileage. By the way welcome to the site.2009 GT Sedan
Exterior: Performance Red Metallic
Interior: Ebony
The lease on my 2006 GT Sedan (Gray) was up and I loved the car! No doubt about the choice for the new car.
Sticker on the '09 est. city mpg is 17 - the DIC tells me 23 around town! The '06 was consistently around 25 in town.