The redesigned Infiniti QX50 is powered by a 268-hp, 2.0-liter turbo four-cylinder engine mated to a continuously variable transmission. The variable-compression engine is supposed to deliver the power of a V6 and the fuel economy of a four-cylinder. But while acceleration is competitive, we got just 22 mpg overall in our AWD test car. The fit and finish of the interior is impressive and the cabin is quiet and roomy. The QX50 has lackluster, but secure, handling. We found the ride to be mostly calm, but some impacts are stiffer than expected. The convoluted controls are very confusing and distracting. Infiniti's optional ProPilot Assist feature can keep the QX in its lane and maintain and adjust speed according to traffic which can be a convenience in stop and go driving. Standard safety features include forward collision warning, blind spot warning, and lane keeping assist.