Converting MP3s

When I download Mp3s I want to put them onto Cds so that i can play them on my Cd player in my music system or in my car cd (Which will not play MP3s). However, i have noticed that when i convert the MP3s that my cd is not big enough(750MB).

Is there a software that lets me convert my MP3s onto the 750Mb cds that i can play in my car.