The midsized QX60 is spacious, quiet, and well-finished, with room for seven but without the bulk of a full-sized SUV. Based on the Nissan Pathfinder, it has a comfortable ride, but handling lacks agility, making the QX feel rather mushy. The Infiniti's 3.5-liter V6 and continuously variable transmission delivered adequate acceleration and returned a so-so 19 mpg overall on premium fuel. A family-friendly feature allows access to the third row even with a child seat installed in the second row. But the second-row seat cushion is very low, compromising thigh support and seating posture. As part of a recent freshening, the V6 gained 30 more hp and towing capacity was raised to 5,000 pounds.