2007 Jeep Grand Cherokee Limited - 4.7 v 5.7 - which is better?

ka52_1

New member
Both seem similarly equipped and whatever we choose will wind up being our first Jeep. Winters are hard here, I don't plan on regular towing or hauling, and we're not making this purchase for the sheer fuel economy. The off road capabilities of this truck look incredible and at some point I'd like to test it out. So how much of a difference will the bigger motor make for daily driving and a little off-road fun? How does the flex fuel thing work - can you add it to regular gas already in the tank?
 
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