thanks guys for the replies
as for my sparkplugs i got the ngk iridium 7's on a stockish sr20det redtop
these sparkplugs definetely changed my idling after driving the car for any time longer than 5 min. while i let it sit to cool off ( since i dont have a turbo timer) lol ...i hear rattlin down through my downpipe and throughout my exhaust .. this happened after i changed to the 7's and previously i had some bosch ones.. anywho yes my bad mileage is very very bad i am in stock boost but i do have to say that i am constantly give it a good big foot push from 2nd gear to 3rd gear many times

:/ its just tempting... but i dont think my mileage should be that bad! .. and also
how do i determine what fuel management i am running?
btw i use unleaded 91 just incase it matters