The question came up in
this thread about how the ScanGauge calculates average speed.
There are different ways it could be calculated, eg...
Quote:
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Is the 32 mph average a true average? eg. x distance / y time = 32 mph or the mean of high and low speeds?
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Another way (which I think would be the ideal measurement) is
distance/time,
but only where speed > 0 - meaning your
moving average.
PaleM indicated he's seen his ScanGauge average speed falling while at rest (with the ignition on), so I went out and did a quick 'n' dirty test.
I reset the current trip, drove for 1 exactly minute, coming to a stop at 1:00, then recorded the average speed for 6 more minutes. Surprise - it does indeed fall while stopped, indicating a simple
distance/time calculation:
Time - Avg MPH
1:00 - 13
1:15
1:30 - 9
1:45 - 8
2:00 - 7
2:15 - 6
2:30 - 5
2:45 - 5
3:00 - 4
3:15 - 4
3:30 - 4
3:45 - 3
4:00 - 3
4:15 - 3
4:30 - 3
4:45 - 2
5:00 - 2
5:15 - 2
5:30 - 2
5:45 - 2
6:00 - 2
6:15 - 2
6:30 - 2
6:45 - 2
7:00 - 2
My ScanGauge II version is 3.15