[calgaryrocks]

^ you cant get payments at zero percent, or the newest technology (backup cameras, bluetooth) with used. yes you can add this stuff on after but it takes more effort. you won't get the same peace of mind with a used car, because unless its a friend you don't know how they really drove it, and can only go on records of maintenance. also newer vehicles tend to provide better fuel economy. the new mazdas have the skyactive engine which you can pretty much only get new.
it also depends on the model, yes you probably can save lots buying a used car that was originally $60k. but if it is a $25,000 car, the used version of a mazda would drop $5k, if you can find a used one that new. that is different than a hyundai for the same price new. and different than a 60k luxury car which drops a higher % and real dollar amount.
it is a decision that looks at more than just the financial side, such as enjoyment of the drive, having new techonology, knowing how the vehicle was driven and taken care of. if you don't have the money to pay for the car in cash but have a consistent job and make enough spread a month then 0% financing saves you some time and you can invest the rest of the cash instead of blowing it all at once on the car. anyways rant over.