Although we’re enthralled with the new VC-Turbo inline-four engine, we won’t rehash all the details again here. If you haven’t yet read up on the engine tech, check out our comprehensive overview from when the engine debuted at the Paris auto show last year and our report from briefly driving a prototype QX50 earlier this month. The quick summary is that a system of links and levers allows this port- and direct-injected engine to vary the stroke length of its four pistons by 1.2 millimeters to alter the compression ratio from 8.0:1 to 14.0:1. When it’s making close to its peak output of 268 horsepower and 280 lb-ft of torque and, say, sprinting to a claimed 6.3-second zero-to-60-mph time (that’s for the quicker, all-wheel-drive model), it will be running a lower compression ratio and higher turbo boost. But when peak power isn’t needed, it can ratchet up its compression ratio and, correspondingly, its efficiency. Infiniti predicts an EPA combined fuel-economy rating of 26 mpg for all-wheel-drive models and 27 mpg for front-drivers, with the only transmission being a continuously variable automatic (CVT). While those ratings are at the top of the segment, they’re not a huge leap from the 25-mpg rating of an all-wheel-drive Audi Q5 or BMW X3, and it can’t match the Jaguar F-Pace diesel’s 29-mpg figure. As soon as we can get one to test, we’ll give you a full report of how its real-world fuel economy stacks up.
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