On paper, the 2007 Infiniti FX45 and the 2007 Mercedes-Benz M-Class are comparable luxury SUVs. In use, the FX45 has the sport and the utility. Mercedes describes the ML500 as “an SUV with sports car spirit.” The ML500’s 302-horsepower V8 engine and 7-speed automatic transmission combine for 0 to 60 mph in just 6.7 […]