I am thinking of changing my plugs in my 4.7 to a better plug that will help a bit with mpg but am not sure what plug is best. Any ideas?

DC

 

running hotter plugs will only benefit you if you are running a higher octane gasoline; which will be costing you more in gas. furthermore, to be really getting everything you want out of a service like you are suggesting, you would want to get new wires, cap and rotor as well. bosch makes several different lines of plugs for the motor you have. look around the forum with the search tool and see other people's opinions on different plug's benefits and problems.