@tmakaro if your simply looking to save money with fuel economy with the diesel then like others have said it will not be worth it. However what no one in here mentioned is the drivability factor of the diesel. Before I bought my JKU I was also looking at Grand Cherokees and I test drove all (3) Engines. During that time I feel in love with how the diesel drove, so if your on the fence I would say go and test drive a GC in both the Pentastar and the 3L Diesel and see which motor you like better from a drivability standpoint. The JL wont be exactly like it, but it should give you a feel for the difference.