Ten years and still going. I still get the same miles per gallon as day one (I keep a log), one tune up at 100K, only peformed normal maintanence. The only thing my AC needs to be charged if it's the compressor it's the only thing on the car, other than tires that would not be original. It rides great and if I can fix the AC I hope to be doing this again at 200K miles right now I'm at 116,600.
Great pick up and passing ability, very reliable. Never worrying about turning my lights on or off or forgetting my keys in the ignition.
There can be no improvements, they discontinued the best car Chevy made.