This car has been an excellent performing car. The Special Edition Package sets it off. The leather interior, dual automatic temperature controls, and chrome wheels are great and generally found only in more expensive automobiles. Never a reliability problem. Mileage runs 23- 25 city and 30-32 highway. May not do quite that well with an ethanol mix, but still close.
This is the best car for the money I've ever purchased. It's the best "regular car" I could find, and I am quite pleased with the performace, mileage, and comfort. I drive 100 mi. a day round trip for work and I love driving "Miss Daisy". (Yes I name my vehicles)
I also have a LaCrosse and the Century has a smoother ride and more comfortable seats, plus much better gas mileage in the city. Do not listen to the auto experts that believe a harsh ride, stiff seats and a run through the cones is what the real world of driving is. I have 9,000 on the Century and test drove both Camry and Accord prior to purchase, both rode stiffer and were not as powerful. Plus the quality with the Buick is just as good. The six is fine and getting on ramps and passing is no problem.
I've owned Geo metros, Toyota corollas, and other cars. The 2005 Century I bought shocked me with 36 mpg on a 1000 mile trip. My 1999 corollas only got 38 max. I was so impressed that I bought another used Century (1999). Why buy small cars when the comfort/power/reliability of a Century gets near same mpg? My 16 yr old son didn't want me to get a "grandpa car", but he sure loves it now that it's his! Dependable, reliable, affordable but I was careful in my research and examination of used Centurys. I walked away from some "bargains" because I found rust carefully concealed or the engine/ride didn't sound/feel right. I'm going to buy one more soon!