[ImmaSquashYou]

heh, yea, i read through some of your posts and thought i read that you replaced them, but when i went back to find it, i was like screw this, i'm not re-reading this whole thing.

Anyways, yes, definately keep our overdrive on. Meaning there should be no light on ur dash taht says o/d. When we mean scanner, i think the other orgers are saying to rent one from autozone. Its a sanner that hooks up underneath ur driver dash to test the codes. (i'm sure you know what i'm talking about and sorry if i'm talking to you like you do'nt know what your talking about). Since you did have an ecu swap, maybe it didn't fully reset for some reason. How long have you had your spark plugs in there? If its been a while, maybe pull them out and see if your running rich or lean by the color of your spark plugs. I really can't think of anything else that will give you such horrible gas mileage. Did you try throwing in one of those fuel injector and running 93 octane gas? And go to a good gas station, like a sunoco, mobil, lukoil, exxon. Exxon tends to give me the best gas mileage for the i30 for some reason. I know its not suppose to make a difference, but it does, and i can't complain. do you have an exhaust leak by any chance? Do you have any mods?

p.s., when i'm rolling at around 30-45 miles an hour, i'm usually at around 1.5-2k rpms...