The Xterra we tested was powered by the new supercharged version of Nissan’s 3.3L SOHC V-6. This engine produces 210 horsepower at 4,800 rpm and 246 lb-ft of torque at 2,800 rpm when backed up by the automatic transmission. Our test Liberty was powered by a 3.7L SOHC V-6. This engine produces 210 horsepower at 5,200 rpm and 235 lb-ft of torque at 4,000 rpm. Even with the supercharger, the Xterra proved slower than the Liberty, and it requires 92-octane fuel.