my 00' sedan se spi has 24xxx miles, and am getting around 200 miles per fill up till the gas light comes up. sometimes, its even worse at 175 miles, when driving with a/c on 30% of time. i changed the rims/tires (there 16lbs rims) spark plugs/wires (motorcraft platinum tip) mobil 1 5k oil, and k&n oil filter. only mods are lunch box delete and k&n cone filter on stock intake tube. transmission shifts smooth/ fluid is bright red. i don't know what else to check, but at 200 miles per fill up divided by lets say 11 gallons (till gas light is on) it just dosen't seem right. also, i checked tire pressure and all is up to date. any help? maybe i shoulld change the fuel filter? would that help?