A 1200-mile outing to Zion National Park has editor-in-chief MacKenzie gushing: "We arrived home at the end of a 600-mile day feeling fresh, a testament to good seats and impressively low NHV levels. Find out more about the Mercedes-Benz GL450

After more than 15,000 miles in our regular XK, the extra power and torque from our 2008 Jaguar XKR's supercharged 4.2-liter V-8 is instantly noticeable, even when feather-footing around town. Find out more about the 2008 Jaguar XKR from the