 We were deciding between the Hyundai Azera and the Buick Lucerne.  After driving both cars and reading the reviews in Edmunds.com, we decided to purchase the Azera.  The milage is as advertised as we got 29 MPH on a round trip from Phoenix to LA and back. In town we are doing 23/24.  The performance is outstanding.  I really have to be careful not to push it because it is so quick.  The ride is smooth and quiet.  The car is really sharp and we get a lot of comments on how well it looks. 