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Well heres the stats-
3.9- 175-180 HP220-225f-lb
4.7- 230-260HP 295-315f-lb
5.2- 230-235HP 295-310f-lb
5.9- 245-255HP 345-350f-lb
I'd say the big winner is the 5.9 (Duh!) and for fuel economy (if you must) get a 4.7!