Using a two-motor hybrid system, the HS 250h uses a 141 hp drive motor that combines with the 147 hp gas engine. A second motor in the hybrid system serves as both engine starter and generator to charge the hybrid battery pack. The two-motor system also uses an electronic continuously variable transmission (CVT) that maximizes efficiency, simplicity and compact size with extremely smooth and quiet operation, according to Lexus. A motor speed-reduction planetary gear unit helps provide high power output in this small package. The HS250h also uses a shift-by-wire system that eliminates the need for bulky shift cables, saving space and weight while allowing much more design freedom in placing the shift lever in the interior.

2010 Lexus HS 250h Hybrid

The 2010 Lexus HS 250h hybrid sedan will debut from Toyota's luxury brand in August to compete with BMW's 3 Series and the Mercedes-Benz C-Class.