The numbers are officially in on the all-new Pentastar V6 and it will be pumping out 10 more hp then previously stated in the upcoming 2011 Grand Cherokee. That brings the grand total to 290 hp and 260 lb-ft channeled through a five-speed automatic. The optional Hemi will be rated at 360 hp and 390 lb-ft, also channeled through a five-speed automatic. Definitely notable is the estimated fuel mileage in the V6, which is expected to come in around 18 mpg city and 26 mpg highway. That is significantly better than the current generation Grand Cherokee’s 3.7 liter V6. The Hemi will probably be rated right around 14 mpg city and 22 mpg highway. For that kind of power the Hemi has a somewhat acceptable highway rating in my opinion. More news is sure to flow out on the 2011 Jeep Grand Cherokee as it is anticipated to go on sale next month and arrive in dealerships shortly after.