How do i make an mp3 cd with iTunes?

Question

I have a CD player in my car that plays mp3 files burnt to CDs.  I used to use Realplayer to burn mp3 cds, but in order to do that you have to subscribe to their service (you can always burn a CD that has maybe 20 files on it, but the mp3 CDs I  would burn there would contain up to 175 songs).  Since I do have an iPhone and an Apple ID, I thought I should be able to do the same thing with the iTunes player. 
Well, when I choose the option to burn an mp3 recording, it only records about 30 songs on to the disk even when I've chosen more than 100 to download onto a CD.  What do I have to do to create a CD with as many mp3 files as it will hold with iTunes? 
I commute to work and just about live in my car, so this is the sound system I use most of all.  The player in the car plays regular CDs as well, but it's a lot more convenient to have one disc with all the songs you want to hear than a bunch of them.

Answer 1

mp3 files depend on the length of the songs and the sound quality. A CD can only hold so many bits & bytes of data. So, if you have a few really long songs that are at high quality, less will fit than say, short 3 minute-songs at low quality.
This is kinda along the lines of, a movie file will not fit on a CD. You need a DVD, because DVDs can hold more data.
You would have to look at the songs and see how much data they are using. The playlist you're burning has the total megabytes (MB) at the bottom.  I think a CD holds about 650 MB, 74 minutes. If you were getting hundreds of songs with RealTek, maybe you were using a DVD? Or they were really short & low quality?
You could also look into getting a car plug/adapter that will play directly from your ipod.