2007 BMW X5.Start Up, Engine, and In Depth Tour. The X5 is celebrated as one of the world's best-performing luxury SUVs, but one of the most fuel-efficient? We were surprised, too. Credit the technology in the X5's 3.0-liter inline-six—the precise fuel metering allowed by variable valve lift, as well as variable valve timing on both intake and exhaust cams. The tall top gear of the six-speed automatic also helps keep revs down while slipping through the atmosphere at highway speeds. While the powertrain is busy eking the most out of every drop of gas, the driver enjoys uncanny road feel, precise and natural-feeling steering (at least when not equipped with the optional active steering), and one of the best of BMW's modern interiors. We suggest not ordering the spurious third-row seat, which reduces cargo space while adding weight and, therefore, sapping fuel economy. Also, although one of the most efficient SUVs on the road, the X5 3.0si is hardly among the cheapest, with prices charging toward $60000 without much difficulty once a few options boxes are checked. Still, it's one of the best-driving SUVs at any price, and the fact that it's relatively efficient is a sweet bonus.
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