This week's first Road Test features the Kia K4, an all-new nameplate for Kia serving a familiar role in their lineup as a compact sedan for budget-minded buyers. Then we'll start up the Mazda CX-50 Hybrid, a new powertrain for this five-seater crossover. We'll also have a special FYI report on teen driving safety and a "Your Drive" look at DIY stereo upgrades.