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Professional Review
The new Infiniti FX45 is quicker than Porsche's new Cayenne S. Specifically, the FX45 can zip from 0 to 60 mph in slightly more than 6 seconds, while the Porsche Cayenne S takes a bit longer. How can that be? Though the Porsche is more powerful, the Infiniti has a better power to weight ratio. The 315-horsepower Infiniti FX45 weighs about 600 pounds less than the 340-horsepower Porsche Cayenne S. Do the math. (Actually, we'll do it for you: The 4,949-lb. Porsche uses 1 hp per 14.5 lbs.; the 4300-lb. Infiniti has 1 hp per 13.6 lbs.) Infiniti claims the FX45 is quicker than the other hot-rod SUVs, namely the Mercedes M55 AMG and the BMW X5 4.6is. At the same time, the Infiniti models cost less than their German counterparts.
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