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(I don't know about the extra gadget thing)
The Ecoroute compared to an OBD gauge is like a paper atlas compared to a gps. There's an order of magnitude of detail that's missing.
But... you're driving a TDI. OBD gauges don't handle the variable air-fuel mix well. The extra wiring work for an MPGuino will give you better accuracy.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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