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1 - I forget. I think it should turn on just with the USB plugged in though.
2 - Again, I forget.
3 - Yes, apparently Mac's create a larger file than PC's, so you need to delete a small amount from the code in order to get it to work properly. There are several extra settings in MPGuino that aren't used right now, so they can be deleted, like tank size, or you can get rid of the 'CPU usage' screen.
4 - The current code on the googlecode page is 0.75. You can check by loading the code in Firefox, or anything else really, and searching (ctrl+F) for 'opengauge'. The second instance of opengauge should have 'version 0.75' 2 lines below it.
5 - Very little power is used when it's off, it's just an LED, and many cars have LED's that stay on anyway when the car is off, because they drain so little. I left my car off for over a week in the middle of winter with the MPGuino plugged in, and it started right up with no problems. If you're going on vacation or something for an extended period of time, then you should unplug it just in case, but even if you only drive once every few days, I wouldn't be worried about power drain.
6 - No, don't worry about it. The board will automatically switch between 5V and 12V sources based on what you plug in.
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