Equipped with Acura's first-ever turbocharged four-cylinder engine, and given that the consumer marketplace is shifting to CUVs in large numbers, the new RDX was high on our list of must-drive vehicles for 2007. As we discovered on a rapid ride up the mountainside to Idyllwild, Calif., the blown motor is unfazed by altitude and the RDX handles exceptionally well for an SUV. But we also discovered that the Acura has a prodigious thirst for fuel, which makes us question whether a V6 engine would be a more appropriate powerplant. This, in addition to other shortcomings, makes it hard for us to call the RDX an unqualified hit in the segment.