Built to add to the GS's growing reputation for power and technology, the 2007 Lexus GS 450h is a hybrid luxury sports sedan, the first rear-drive hybrid and the first such vehicle to use a hybrid powertrain. Mated to three electric motors is the same V6 engine in the RX 400h - but in this rendition, the powertrain delivers maximum acceleration for superb performance. According to Lexus, the GS 450h beats even the new eight-cylinder Lexus GS 430. Aside from the powertrain differences, larger wheels and a few minor appearance changes, the 2007 GS 450h is identical to the GS 430 in terms of technology, interior and styling.