I have an 06' 4x4 with 315 BFG's ,edge juice, AFE intake and banks exhaust without cat or canister whichever you prefer to call it. Have tried drivin like grams and fuel additives. Nothing seems to work. Best I can get is somewhere around 19-19.5 mpg. Have heard talk of the Fitch fuel catalyst. Can anyone help with info on these. Thanks for the help, Goat.