With the automatic transmission, the four-cylinder engine is geared for good response off the line, and accelerates with verve. The engine is refined, and the automatic seems to work better in this application than with the V6. Sportmatic is also more worthwhile, as the four doesn’t seem to mind revving. Getting a 2006.5 Optima four-cylinder with a stick and the 17-inch wheels would make for a fun, affordable sedan, but Kia doesn’t offer that combination. Those interested in a softer ride and a quieter interior should check out the standard 16-inch wheels and tires, which deliver on both counts but not at the expense of the Optima’s capable handling characteristics and road feel.