Developed by Mazda, launched by Scion, and now marketed as a Toyota, the Yaris iA proves that subcompact cars can delight. A different model from the Toyota Yaris hatchback, the frisky iA sedan stands out in a segment filled with insubstantial models. It feels refined for this entry-level class, with a smooth and willing four-cylinder engine, slick six-speed automatic transmission, and relatively compliant ride.