Sales for the best small luxury cars continue to grow, in no small part because many now match the bigger entries in terms of premium appointments, complete with climate-controlled leather seating, cutting-edge connectivity systems and plenty of passenger-protection measures. However, this new wave of smaller premium choices also complements those creature comforts with nimbler, more agile dimensions and compelling fuel-economy grades. Consider: Not only are these cars compact in size—with footprints smaller than a Toyota Corolla—but they also routinely return EPA scores well north of 30 mpg in highway driving. And as an added bonus, they do so with relatively affordable pricing, especially as compared to the larger luxury sedans.