On a lesser scale, small cars favored by young drivers, who generally have a poorer safety record than their elders, also can be expensive to insure. For instance, the turbocharged Subaru Impreza WRX Sti, beloved of young speedsters, costs an average of $1,639 a year to insure vs. just $1,273 for a more sedate Subaru sedan, the Legacy 2.5i.