i have a 93 mustang lx 4 cylinder and for some reason it is killing me on gas i have a new 02 censor new spark plugs new fuel filter and still no results any suggestions  

maybe try a new air filter. maybe a cold air intake or a throttle body spacer and a new exhaust? are you driving around town or on the highway? when i am on the highway i try to keep it under 2000 rpms and i get close to 23 mpg with my 5.0. i also use 93 octane. i have found that the cheaper gas gets worse mileage and just costs more to run the cheap gas.  

i have a new air filter.I also put fuel injector cleaner in and i usually run mid grade gas and it seems to make a noticable difference but overall it still isnt doing as well as it should be  

how many miles are on the car? you might think about a new muffler or cat. either one of them might be clogged and cause too much backpressure and causeing the bad mileage  

do you know what size gears are in the rear end?  

it has 153,000 miles as far as the gears i have no idea the muffler seems a little bent from a previouse accident before i bought it but i didint know that would affect gas mileage