mach4, I also had one of those mpg computers. This was back in the early 80's. I also have tried to find another one, or something like it but have come up empty handed. 3 or 4 years ago I did a MPG computer using a ZX-24 processor and a MAF unit from a 5.0 Mustang. Using the amount of air entering the engine, the mixture ratio from an o2 sensor, distance traveled, etc I got a close aproximation of MPG. It was within 10% of actual after a fillup. With a little tweaking of the software I could have gotten it better. I repurposed the project with the intentions of making another one later.

Paul

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84 500 SEL (307,xxx miles)