Switching Jeep Grand Cherokee engine from V8 to V6. Would it work?

Hi, I have a 2001 Jeep Grand Cherokee- Limited; V8, automatic, 4.7l

Since the mileage is now high I wish to switch the engine for newer one,

but now I am thinking that getting a V6 engine might save gas in a long run. To be frank I am not sure if there is a counter part for my car.

WHAT DO YOU THINK? Is it possible?

1. how much gas - mile/gallon - should do you think I should expect to save
2. how much would it cost?
3. putting above questions into consideration, is it worth it?

thanks in advance!!!!
 
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