I have done some searches, didn't find what I am looking for, but I have a 92 Coupe Deville, 72,000 miles on it. I do not have a factory service schedule, and I was wondering if it is due for a tune-up. The gas mileage seems like it is falling off a bit, but either way, I wanna keep it running at its best.

Also, I was wondering about the stereo. it does not have the bose system, just the factory am/fm/cassette with the 5 band eq. I was wondering if there is a factory cd player that is interchangable with this head unit.

THANKS!!