ok so when it was warm out i noticed i wasnt getting very good mpg, so i backed off ALOT on "gunning" it and it got better/semi normal. now its cold (and i even put my 175 tires back on, i was running 205 and thought that may be the reason) and it is terrible! i am at a half tank and only 145 miles! i dont belive i have ever had the timing checked to see if it was normal/ to specs. ill stop pussy footing around and ask my question now. if the timing is below specs could this be the cause of my horrid mpg? i changed the plugs about 2 months ago (brand spankin new oem ngk) and gapped them perfectly.