I think the main thing was trying to build a smooth development path. So the easiest thing is to get V1.0 using the existing arduino platform with the features being a basic mpg unit. The current system is very good and I would consider it a 1.0 for most purposes. I have one in all my cars now and will be installing a few more for friends in the next few months.
I think for V2.0 it will need a bigger chip in order to be able to do all the neat stuff that was talked about like calculating aero drag and rolling resistance. But I don't know of a well defined road map to the project yet. DCB is pretty much the project manager/main developer so he would be the one to know about the future plans for it. I am just now getting up to speed on the whole arduino library set and will hopefully soon be helping him do some coding to it.
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