Burning fuel.

[johnnyj773]

I have a 2000 pontiac grand prix gt.For the past 2 weeks my car has been burning waay too much gas.I fill up,drive a total of 24 miles to and from work and i'm already burned a 1/4.I drive about 60-65 mph.I have a cat-back exhaust system and CAI.The engine light has been on for a while,muffler shop tested it,its reading an air code,410 i think.Got the cat convertor replaced.and the secondary air injection pump and cut off valve needs to be replaced.This wouldnt be causing it to burn would it?