I decided to try different CD burning software. So, instead of using iTunes, I tried the trial version of Dragon Burn. The program is easy to use, but the audio CD it generated did not play in the car, while it did play on other players. Next, I plan to try a different CD burner. I have 2 external firewire units that are in the closet, so I'll unpack one of them and try that out.
Update: I did the above test. The CD burned using an external TDK burner played fine in the car. It was an old 16x model and took 22 minutes to burn an 18 minute podcast. yikes!