Dynolicious
http://www.autoblog.com/2008/07/29/d...formance-meter
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But if it uses the accelerometer inside the iphone, I think the limitation would be in the accuracy of that technology.
On a side note, you could probably manipulate the output data by moving/pushing the iphone in your cup holder as you drove.
Just speculating here. I don't have any experience with it.



