Visitors look at the Toyota Lexus GS 450h at a Toyota showroom in Tokyo, on July 1, 2010.

AP Photo/Shizuo Kambayashi

Hybrid Car Horsepower vs. Standard Car Horsepower

If you know how a hybrid car works, then you know it uses a small gasoline engine, just like a standard car. But, what makes it a hybrid is the presence of a small electric motor. That electric motor is key, because using energy from the hybrid's battery pack, it can power the hybrid at slow speeds. That allows the gasoline engine to shut off when it's not needed, which saves on fuel an emissions.

That's not all the electric motor can do, however. On most hybrids, the electric motor can also send power to the wheels alongside the gasoline engine. That translates into plenty of power - in some cases more than comparable standard cars.

Take the Lexus GS 350 sedan, for example. The GS 350 has a 3.5-liter V6 that makes 303 horsepower. That's not too shabby. But, the hybrid GS sedan -- the GS 450h -- has the same V6 engine. The engine alone makes 292 horsepower, but, when you add in the contribution of the GS 450h's electric motor, the total horsepower output rises to 339 horsepower. Even against the gas-only Lexus GS 460, which has a 4.6-liter engine and a maximum horsepower rating of 342 horsepower, the 450h's output is pretty close. Despite having a much larger engine, when compared to the GS hybrid with its electric motor, the GS 460 only makes 3 more horsepower than the GS 450h.

So that's where the debate on horsepower between hybrid and standard cars comes from. When looking at a car's power output, should you look at the horsepower generated by the gasoline engine, or should you take the contribution of the electric motor into account?

Most car reviewers put it in real-world terms. When you're driving a hybrid, you likely won't be able to tell when the electric motor kicks in to help the gasoline engine out. The car reviewers at Consumer Guide Auto say that in the GS hybrid, "The gas/electric powertrain lacks the immediate kick of a V8, but the 450h does surge ahead with dispatch. A test example did 0-60 mph in 6.1 seconds. Overall, the hybrid system calls little attention to itself."

From a technical standpoint, it makes sense to compare hybrid horsepower to standard car horsepower only in terms of the contribution of the gasoline engine. But, out on the road, whether the car's power is coming from an electric motor, gasoline engine or a combination of the two isn't likely to make a difference.

For more information about hybrid cars, horsepower and other related topics, follow the links on the next page.