my 2008 mazda 3 Isport sedan
 

my mazda is giving bad gas mileage all am getting is 200 MPG to a tank i have change spark plugs did fuel injection cleaner and make sure my tire right and still not getting the gas mileage can any one help letting me know what else can it be

Honestly, the 2.3 gets pretty terrible gas mileage overall, but only 200 miles to a tank? Are you positive because that works out to be about 13 mpg, which is not good at all. have you checked for any leaks or maybe you are running rich? Let me know.