[/quote] I wonder whether part of this could be a mismatch between metric and imperial measurements. Rockdude mentioned he rides at 6000 feet, but that Aerolab screenshot looks like the distance is in km and the elevation is in meters.[/quote]



I think this is the issue. I am pretty sure my altitude data is good. The eoffset auto box does nothing. The elevation line is is pretty close and it shown in feet, The VE line is the line that is off and I think its being shown in meters. I will play around and see if my head unit will record in meters and also try to delete my altitude data. FYI- have had the same issue with two different head units, Joule 2 and the Garmin 910.

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