I've thought about EFI from the 87-93 cars, but that would involve more effort than what it's worth. Since the car was and is carbed, I would have to not only change out lots of intake and engine bay parts, but also run quite a bit of wiring and fuel lines. And I would have to put an EFI tank in too. Not worth the extra 2 horsepower the EFI engines had. When the old computer system worked, I got 20mpg around town and 30mpg on the highway. It declined quickly over the first years I owned it and it started stalling and pinging loudly. After tinkering with replacement parts and trying some recalibrations, I finally put in a roller cam, ditched all the electronics, ditched the 1 barrel for a 2 barrel, removed the air pump and converter (Which was TOTALLY clogged!), and redid the maze of vacuum lines into a few orderly sections. After all that, the car runs like its new, has good power delivery, and sounds healthy, but the fuel economy isn't too great. I've experimented with timing, jetting, and fuel enrichment to find that the car ALWAYS gets 18mpg. Go figure. As a side note, I may try some 5W30 in it. In the winter, it cranks really hard and the lifters clack loudly until the engine warms up.