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I don't know what JohnnyGrey's plans are with his device, he has only announced that it is not open source. But there are a number of people working on the open source mpguino . The goal of that project is to put fuel consumption feedback into as many hands as possible (read cheap and easy), so if you take a look and post over there about where we lost you then you would actually be helping too
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My plans are to develop it, add features, debug as necessary and once I'm satisfied with its performance, offer it for sale. The board itself is quite simple. The final design will be a sandwich type board. The AVR board will combine with the display board via header pins. I'm considering leaving off the switches and allowing the use of remote switches, which can be placed in more convenient locations. It will not come in a nice finished box like the SG, but if you can cut a rectangular hole, you can mount it nicely in a panel somewhere. Since it will come programmed and ready, it shouldn't take an EE major to get it going. Creating an open source meter is admirable, and I've worked on a few open source linux projects myself, but seeing as how I'm not using any open source or prepackaged components (and coding in asm no less), I don't feel the need to give away many hours of slaving over a hot keyboard for free. I do have capitalistic tendencies.
