Originally Posted by TheIdiot
Don't want to pay for the gas......yet.....
There isn't much difference in mileage between them. That is, if you go with a stock-ish 5.7. You won't get over 20 MPG with either of them.
Thing is, the hemi doesn't have to work as hard as the V6 to move the Jeep. And that makes as big a difference in mileage as engine size.
Since there is no kit to swap a 3.6 in place of a 3.8 you're talking about a ton of custom work to make it happen. There are kits to swap in a hemi in place of a 3.8 which saves you a ton of work and better performance without really sacrificing gas mileage.