i have a 99 gsr and the only mods i have done to it is a true cold air intake and a performance muffler. i am only getting about 210 miles to the tank. i dont understand it. im wonderin if its the 2 15"s in the hatch? i have to drive 80 miles to school and back and 30 to work and back so needless to say my ass is spending about 45 week. way to damn much. what kind of mpg should i be getting and whats wrong?