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Ronnie has pointed to a very good and important resource, the How To and Diagnostic guides that are at the top of the page. There is a wealth of data and real world examples from the Reatta community. Also, use those sections to learn to use the onboard diagnostics and controls. I believe the 91 may have more items available in diagnostics but this is what is available on my 90, which should be similar. Under BCM Data, BD50 is live battery voltage and BD51 is Generator Field Strength percentage. These can be read even while driving once you get used to the system. It may help to see if the voltage or field is erratic. Under the BCM Inputs section, there is B151 which is Generator Feedback. I am not 100% certain on that function but I believe it indicates if the generator is following commanded operation? There could be several reasons for rich running, possible misfire, poor mileage, but the O2 sensor is inexpensive and a good place to start. It is the only actual fueling feedback on these cars. The O2 operation and resultant fueling indicators can also be read in the ECM Data section of diagnostics while sitting still or on the road. The system is relatively basic compared to modern vehicles but it can tell you a lot and it is already built in. It can do pretty much anything a scanner can do. Good luck

Also check the battery cable connections as described here: Battery Cable Checks & Repair This happened to me and caused the electrical system to go crazy.

This shows where to start checking the grounds. Ground Terminals & Junction Box Location

May need to break up the problems into smaller bites to get a better focus on each one. Two batteries and alternators in two years is not normal. I know parts quality is getting to be hit or miss proposition at times but??? I am always a little hesitant as the 91 is rarer and we find differences we didn't know about, but I believe the alternator is not self-regulating and is controlled by the BCM. The problem may lie there. That said, I would go over all the ground points as poor grounds can cause all sorts of weird behavior. Are you familiar with the Reatta systems? Brown coolant this soon sounds like the initial flush may not have been as thorough as needed. The temperature gauge could be part of the electrical issues or a coincidence if it works normally otherwise. 20mpg for an overall average wouldn't be terribly out of line, especially not knowing what the conditions are based on. This car may be compact but it is not lightweight, and weighs as much or more than a LeSabre of similar vintage. Also, the 91 has a numerically higher gear ratio. It does have slightly taller tires but the net result is 9% higher rpm at the same speed. If the O2 sensor age is unknown, it should be changed. It is what sends the signal for the ECM to control fuel mixture.

Now I remember why I never took this trip and most likely never will. She just boarded the plane in Cairo (1:15pm EST my time) and I will pick her up tomorrow in Knoxville at 2:09pm EST. Between 3 different flights and layovers in airports that's over 24 hours to get home from Egypt. I'm too old and don't have enough days left to waste one of them that way. 🙂

Outstanding! Don't know if I'll ever get there, but the pictures are great.

Glad you enjoyed the photos. Here are a couple more that she sent me today. Those Egyptians sure did like to carve on rocks.