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I am in the minority--I contend that small fill-ups can give you an accurate notion of overall MPG.... If you average them over enough fills. But that doesn't do you any good if you want to try out lots of mods in a short time.
If your 87 is not an Si, then I don't think the MPGuino will work. I believe that the carburetors on the 1st-gen "DX" (or standard) and HF CRXes don't provide the right electrical signals for it. The Si's MPFI (Multi-Point Fuel Injection) should, though.
The MPGuino is probably the best way to see short-term results of any mods you make. However, you should keep in mind that temps, winds, humidity, traffic, road conditions, and other things beyond your control will have effects that are larger than nearly any mod you can make. And your driving definitely can have a much larger effect on your fuel economy than any mods.
I personally think that long-term averages are the best way to gauge what you're doing and if your mods work. But the downside is that it takes for ever to test anything.
-soD
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