Thanks to all for your input.
I just made it home from my 9+ hour drive. The car did beautifully on the highway and returned about 25MPG from my math. Not too shabby considering I ran 75-85MPH the whole way with the HVAC on.

This car must have had some suspension components refreshed. It rides so nicely on the road, just soaks up the miles. HVAC was also working extremely well. I did pop a fuse to the radio when trying to plug in my car charger to the cigarette lighter, but I was able to borrow one from the 'rear seat heater' slot to make the rest of the drive tolerable. However, it seems my cigarette lighter doesn't want to work, or the accessory being plugged in must go in at precisely the angle/depth/alignment of stars.

Cruise control worked early in the trip, but after I swapped that fuse it did not any longer. I'll have to double check that the cruise wasn't tied into that fuse, but I don't think it was. Are the cruise control stalks (lever itself) known to be a problem on these cars?

Also noticed in the engine bay is a decal stating the AC has been converted to R134. This wasn't something mentioned to me before but is a nice surprise.

After my drive today, I think I will hang on to this car for a while. It'll be perfect for putting around town for work errands (real estate).