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http://www.jeep.ca/en/grand_cherokee/2011grand_cherokee.htmlAll-new Pentastar™ engine
Think of it as an intelligent workhorse. The all-new 3.6L Pentastar™ V6 engine features Variable Valve Timing (VVT), showing an increase of 33 percent in horsepower and 11 percent in torque over its predecessor — while also improving fuel economy up to 11 percent.
Bottom line: Better fuel economy without sacrificing power.