I have a 1995 Mystique 2.5L, 5-speed, with 184K miles.

I have always gotten 24-25mpg at 75-80mph, with the A/C off. In the summer, with the A/C on, it goes down to 21-22.

The few times I have driven for long distances at 60-65mph, I have seen up to 28mpg.