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All those data points (MAP, water temp, oil temp, etc) might be useful for analysis if they are logged along with your speed & MPG, and analyzed later on your PC; but i dont see how one can read those values real-time to optimize your driving habits. Even if you could (and manage to drive safely), your wife/kids surely cannot.
Best thing for the family members is a simple "This is your MPG" display, so they can ease up on the gas & instantly see results. Also, if you are the bread-winner & buying all the gas, they might not care about MPG (but lucky you if they do).
As for your question about why MPGuino doesnt display all that other data... yes, limited ADC, plus each signal needs to be wired. 'Guino only requires 4 wires, one being ground, so it's nice and clean. if you want all the other data, maybe you want an OBDuino instead?
Looking at the schematics, it looks like a hybrid MPG/OBDuino could be rigged. I just bought my first OBD2 car (98 tdi), so i might try it. I'd like to be able to probe the OBD port for the ancillary data, but for MPG, i'd rather keep the MPGuino method of reading the injectors, than blindly trust what the OBD thinks my MPG is. My concern about building the OBDuino, though, is availability of the transceiever chip, mc33290, or equivalent.
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