I bought this car for work. The Trunk is great, I have to carry a lot of equipment and it is nice. I have the SS which has the V8. On the highway it get 25-26 avg MPG. It switches from 4 cylinder to 8 cylinder smoothly, which a was concerned about before I bought the car. The Ltz owner I read the review must not drive but to his mailbox and back to get 17 avg. My 2004 GMC has better avg MPG than that (in the summer).
Handles pretty good for a big car. SS suspension, and V8. Huge Trunk, love it, everything is safe and dry. Heated seats and sunrooof. SS is cheap reliable fun.
SS rides a bit rough compared to regular impalas. Front wheel drive makes it surprisingly good in snow with the performance tires, but the V8 power is hard to lay down without replacing expensive tires.