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The car has three power sources: a 3.5-liter V6 with dual injection that
makes 292 hp at 6400 rpm and 267 lb-ft at 4800 rpm; motor generator one,
which is the primary generator, engine starter and controller of engine
speed that makes 180 hp; and motor generator two, which drives the rear
wheels, makes 197 hp, and is the main piece in the regenerative braking
system. As we have learned with previous hybrids, you can’t tally the
total horsepower of all three to get a final number. Lexus says the
total output of the system is 339 hp, which helps make the GS 450h one
of the quickest cars Lexus has produced. With the instant torque
delivered from the electric motors, the GS 450h accelerates from 0 to 60
mph in 5.2 seconds. For comparison, the GS 430 needs 5.7 seconds to get
to 60 mph. Also impressive is the thrust from 30 to 50 mph, which takes
just 2.7 seconds. Equally impressive is 40-to-80-mph acceleration and
the 60-to-100-mph run where the acceleration pushes you in your seat.
Top speed is 131 mph. When talking about fuel mileage—a big selling
point for hybrids—Hermance is quick to say “your mileage may vary.” He
said that repeatedly. In other words, the EPA cycle for getting the fuel
mileage numbers—27 city/28 highway, a combined 28 mpg—does not
necessarily reflect what you can get in the real world. Toyota has taken
some lumps from Prius owners who didn’t achieve EPA numbers from their
cars, so the company is trying to be out front about it. For comparison,
the gasoline-only GS 430 is rated at 18 city/25 highway, the GS 300 at
22 city/30 highway. |