1. Premium Convertible/Roadster - Mercedes SL-Class: 957
The Mercedes-Benz SL-Class had the highest score of all the vehicles in this year’s Total Quality Index with 957, taking the award in the Premium Convertible/Roadster category. The 2014 SL550 is priced from $107,625 and comes powered by a 4.6-liter V8 Bi-turbo engine providing 429 hp and 516 lb-ft of torque. The luxury roadster returns 18 mpg in the city and 25 mpg on the highway.