Chevrolet, GM’s largest brand, leads with eight, along with five each from Pontiac and Saturn. Four-cylinder, six-speed models of the Chevrolet Malibu and Saturn Aura lead among non-hybrid midsize sedans with 33 mpg highway, along with the Pontiac G6. The Chevy Cobalt XFE and Pontiac G5 XFE win among non-hybrid, gasoline-fueled subcompacts at 37 mpg highway.
Here are the models, along with their EPA-estimated highway fuel economy:
Chevrolet: Aveo sedan, Aveo5 (34 mpg with automatic or manual); Cobalt coupe and sedan (30 mpg for SS Turbocharged; 33 mpg for 2.2L automatic); Cobalt XFE (37); Malibu 2.4L (30 mpg with four-speed automatic; 33 mpg with six-speed); Malibu Hybrid (34), HHR (30 mpg with 2.2L and automatic or manual) and HHR Panel (30 mpg with 2.2L and automatic or manual).
Pontiac: G5 (33 mpg automatic, 35 mpg manual); G5 GT (32 mpg automatic, 35 mpg manual), G5 XFE coupe (37); G6 2.4L sedan (30 mpg with four-speed automatic, 33 mpg with six-speed); Vibe (1.8L model, 31 with automatic, 32 mpg with manual).
Saturn: Astra 5-Door; Astra 3-Door (all 30 mpg with automatic, 32 with manual); Aura four-cylinder (33); Aura Hybrid (34); and Vue Hybrid (32).
Press release via General Motors