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Since the GPS Insight product gets accurate mileage data from the engine’s computer (with most vehicles), we are able to get actual odometer readings and distances direct from the vehicle.
However, we only pull an odometer roughly every 20-40 minutes. We typically get location updates every 1-2 minutes, depending on stop activity.
We provide BOTH the “Odometer” as well as the “Measured” mileages, but they sometimes differ, due to the frequency of odometer readings.
Our product is typically able to accurately reconcile the two, but differences do emerge. These differences typically exist on the “border” days – those first or last readings for the period of time in the report.
Here is a report experiencing this issue (a 22 mile discrepancy – if necessary, the map will solve the problem):
Consulting the map, we see the trip in and back out of New Jersey (the color shift from light to dark indicates direction)
Computing the rough distance for the “fastest” way to travel 1/2 of that route yields 26 miles – the 52 miles “measured” distance proves to be accurate. This is due to odometer readings not being sent until the following day.
In practice, over the fuel tax reporting month, this issue rarely causes a discrepancy, provided the final odometer reading has been sent.
Typically, odometer readings will be more accurate than measured readings (by 1-2%, since measured readings are straight line distances, which are usually 1-2% less than the actual distance traveled). However, odometer readings can understate true mileage by 20-40 miles at the end of the reporting period if the readings had not been sent.
As with all GPS Insight reports, the data is very accurate and reliable – however it is never to be 100% relied upon without human scrutiny. As with the “speeder” who was really only spinning his wheels in the snow and not really speeding, there needs to be a level of judgment whenever GPS data is relied upon for tax, billing, or personnel purposes.
