I just ran across a web page that gives the estimated gas mileage for any model car. You can also calculate your estimated fuel cost based on your current gas prices. It is pretty cool. I was upset because I average 17-18 mpg around town, but I see that the 3.3L is only rated for 19mpg city so I am not that far off. Check it out.
http://www.fueleconomy.gov
http://www.fueleconomy.gov