You should see an improvement in mileage depending on your driving habits.

13.5 around town and 15.5 highway

what gears you got? my 01 with compounds and 250's gets 16 highway with some city driving. Has been 18.75 on a strictly highway trip.

4.10's and a heavy foot.

damn yea that will explain the bad mpgs the heavy foot always gets me but i think i might invest in the fire ball 50s i cant go no bigger than that with just having a shift kit and flex plate done to my trans hoping 50s andy my hyper tech max energy wont be to much for my trans what you guys think

With a heavy foot it wont last very long. Unfortunatly mine is still stock and is in pretty sad shape:argh: Slips the tc really bad and misses the 1st to 2nd shift if my foot is in it. Oh well one of these days it will be fixed.

well that hyper tec only puts out like 30-40 horse i say id have an extra 80 horse with all i got i ran my addr. when i had it on PL5 it did alright i think my shift kit helps out alot but i dont know i think it would do ok with 80 hrse over stock but i still need your guys opinions thanks RED

oh ok I didn't know what it put out. With that you should be fine then.