Mazda is introducing a new Mazda6 sedan starting this fall. The flagship mid-size sedan pricing starts at $30,695. Photos courtesy Mazda USA. Mazda has raised the bar with its flagship sedan, with an all-new 2018 Mazda6 that goes on sale early this Spring. In anticipation of the new model, we drove the current model, and put our sights on what’s to come. Without a doubt, the Mazda6 is a classy, fun-to-drive mid-size sedan. Mazda6 has received improvements every year it has been on sale.