I don't use cruise control much on my 244, and I think I'm even less likely to use it now that I've found it doesn't seem to want to set at higher speeds.

While driving on the interstate last week, I pulled out of a group of cars and so I was ready to set the cruise control and let the car do the work up and down the gently rolling hills I was in. However, it wouldn't stay at my speed, which was just over 80mph. I'd slide the switch to the "On" position and press the "Set" button on the end of the turn signal indicator, but the car would coast well below the speed at which I had set the cruise control. I didn't let it slow down enough to find out what the highest speed it would cruise at, but it was definitely under 75mph.

Is there a hidden upper limit that cruise control will set itself at, or does this problem just sounds like one that comes with age?

It's not big deal, as the hills were probably too steep for cruise control to adequately compensate for (at times I was going from coasting to nearly full throttle; horrible gas mileage, I know) and I like being in complete control of the car, especially at faster speeds, but I was wondering if anyone else had experienced any problems like mine.
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'89 244 GL--25/22 ipd sways, Alpine head, Eclipse front speakers