Okay, I've been playing around and found a work-around. Instead of cutting the CD with iTunes, I converted the MP3 files to 'Audio CD' (cda) using dBpoweramp Music Converter and burned the CD using their writer. The results were as I expected. The CD's are now playing in both of my vehicles. Your comment Zevoneer, that Audio Cd's should play on ALL players led me to try this. A BIG THANK YOU for that Zevoneer! BTW, both players are also displaying each track song titles also, which never happened with the CD's burned on iTunes.
However, this still begs an answer as to why iTunes Audio CD is apparently not formatting properly. Is this an issue that Apple should be dealing with? How or who do I present the problem to?
Thanks for your help!