2010 Lexus HS 250H - Review of New Hybrid Compact-Luxury-Sedan

As different as they may seem, there's one thing the BMW 3 Series, Audi A4, Lincoln MKZ, Mercedes-Benz C-Class, Volvo S60, Acura TL, Infiniti G37, Cadillac CTS, and all their competitors have in common: None of them is offered with a gas/electric hybrid powertrain.

The debate continues as to whether hybrids are a viable long- (or even short-) term solution to the cost/efficiency/emissions conundrum. A lot depends on the cost of entry, the price of fuel, and one's desire to minimize his carbon footprint. No matter, consumer desire for hybrids has never been stronger. The Obama administration's mandate for earlier and more aggressive CAFE standards will push the hybrid demand curve harder. Lexus has made its call and is first in the compact-lux-sedan pool with the new-for-2010 HS 250h.


It resembles the brand's own IS, and, at about two-inches longer than a C-Class, fits dimensionally midway between the IS and larger ES. But the HS 250h employs an entirely different chassis and bodywork. The gasoline engine, electric motor and hybrid drive system, and electronic controller hardware are architecturally similar to those in the Toyota Prius, although most everything is larger and more powerful for this application. There's a bit of under-the-sheets borrowing from the Toyota Avensis sedan sold in other markets. Yet, in spite of a familiar and familial Toyota/Lexus look and feel, it is fair to call the HS a dedicated hybrid platform.

Lexus says models like the RX 400h and GS 450h are "no compromise" hybrids, vehicles that deliver modestly improved mileage with little loss of performance or luxury feel. The HS 250h, like the Prius, is about maximum efficiency with minimal environmental impact. While most players in this category rely on at least six cylinders for power, the HS's gas engine is a 2.4-liter Atkinson-cycle four, rated at 147 horses. Two electric motors assist the total horsepower rating up to 187. Again like the Prius, the powertrain is backed by a continuously variable transmission that varies the ratios depending upon rpm, load, and throttle position. One of the motors acts as the starter, the HS features an auto stop/start function, and regenerative braking helps recharge the nickel/metal/hydride battery pack...Continued