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2006 Lexus RX 400h Test Drive and Review

From Colin Hefferon, for About.com

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On the Road in the RX 400h

2006 Lexus RX 400h

2006 Lexus RX 400h

© Lexus Media
The hybrid system is the drivetrain of the future. Only the power source and the fuel will change. Toyota has designed the engine bay of the RX 400h to enable virtually any internal combustion engine type from the current gasoline to diesel. Even a fuel cell could to be dropped in.

You don’t work your way to Number Two automobile producer in the world (as Toyota has) by not thinking ahead. A conventional 3.3L V-6 engine producing 208hp is assisted by two electric motors (one driving the rear wheels and one the front). The result is V-8 like acceleration in all speed ranges with V-6 fuel economy.

At 31mpg city and 27mpg highway, it’s better than the regular V-6. And yes, that’s no a typo - city mileage is better than highway. This is characteristic of the Toyota parallel hybrid system. Because the electric motors instantly produce 100% of their torque, the vehicle reacts immediately to throttle input. Step on the accelerator at any speed and the response is both instant and authoritative.

Picky drivers may notice a bit more cabin noise during acceleration because the CVT transmission - required with the hybrid system - tends to over rev until it gets to cruising speed.

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