well this was her first big trip, other then going from Oneida to Stevens Point, but this was also right after I had the intake manifold gasket, and the coolant temp sensor at the water pump replaced, the best I had gotten before this was 22mpg, first time was right after I bought the car in West Bend, then it developed an issue that I'm actually still dealing with, where right after start up for the first couple hundred feet, depending on throttle, it has little power and will even back fire before suddenly she "catches fire" and takes off like a bat out of hell, I've already replaced the air intake temp sensor, and now with the intake gasket and coolant temp sensor the problem has gotten better but not disappeared, I even got a different filter to use on the distributor vent system, though it's actually meant for micro brewing systems it still works here.
Though it's odd you say your 93 doesn't encourage a heavy foot as my older brother used to have one and that one could get up and go no problems with the 350 tbi, he just got rid of it when an electrical problem caused him to have to constantly carry an extra battery around with him. Sadly I think the person who bought it just wanted it for demo.