FoRd-BuIlT-tOuGh

Hi i have a 2002 f150 supercrew that im planing on lifting and want to have more get up and go and still keep around the same mpg. Im planning on lifting it 4 inchs and 20" rims with 305/50/R20 tires. I was wondering what rear gear should i go with? I want more get up speed but dont want my mpg to go down and i drive on the higway also. And maybe pull a snowmobile every once and a while. Can any one help me? Thankss

AFSOCSGT

4.10 should work well, some would say 4.56 also.