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Lexus HS 250h – The World’s First Dedicated Luxury Hybrid Car

Lexus 2010 HS 250h

This week announced the latest addition to its entry-luxury sedan line-up, the HS 250h fits nicely between the IS luxury sport sedan and the ES luxury sedan. Research has shown that more than 60 percent of entry-luxury car buyers would have considered a hybrid car if available, and the HS will provide these consumers with a viable purchase option.

Equipped with Lexus’s first four-cylinder petrol engine, the 2.4-litre Atkinson-cycle powerplant is part of the latest Lexus Hybrid Drive System, which generates 187 total system horsepower. The highly efficient Atkinson-cycle engine, made possible by the Variable Valve Timing with intelligence (VVT-i) system, allows the expansion/power stroke to be longer than the compression stroke so that combustion energy can be more effectively used for production of engine power. The HS 250h sedan’s expected fuel efficiency will be more than 30 percent better than the most fuel-efficient model currently in the Lexus lineup, while earning a SULEV emissions rating utilising regular 87-octane petrol. Among the technologies adopted in the 2.4-litre four-cylinder engine are cooling piston oil jets; an optimised balance shaft rate for improved Noise, Vibration and Harshness (NVH) characteristics; and a hot-air venting system mounted behind the radiator.
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