454

and that is no fun

i got a tbi 454, custom full 3 inch exhaust, x pipe, dual exhaust and a chip (all from persious owner) and i get 8mpg city and 11 towing on a highway hall, after that calculations i started crying, then i bought my blazer lol. i know you guys mentioned some stuff for newer big blocks, what could i possibly do for my motor? it's the oldschool 1st gen fuel injection (if you can even call it injection) more like suction, of gas and money! i would like to get headers sometime, my stock manifolds leak like a siv.
oh yea turbo400 trans. 3 speeds of gas hogin!