Hey, thanks for this extra info, @andrewb-1122​! This is good stuff. That GPS-Based IFTA has come in handy a number of times. I don't think I've really gotten into the two-wire stuff as much, so will definitely be looking that one up more.

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Have a great weekend! 🙂

Best,

Joy @FleetNavSystems-1081

Hi @jjake-8255​ ,

Just checking in to see if you still need me to check with the team, or if what Andrew supplied answered all of your questions?

Warm Regards,

Gen

P.S. Thank you @andrewb-1122​ for the help! I've been reading through every question posted this week (to assure everything is okay before the weekend break) and I must say you've been everywhere providing exceptional, consumable answers. It's very much appreciated! 😊

More detailed info would be great, @Genevieve-1051​.

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Been appreciating @andrewb-1122​'s contributions all over here this week, too. Thanks, Andrew! 😎

Yep, all correct above.

Odometer is read on ignition change I believe, and every hour when driving. These will be shown in engine measurements as "Odometer" readings. When Geotab needs to get an odometer value at a precise date/time, it uses those readings to perform interpolations and get a precise value. Doing so can be time consuming and calculation-heavy, so they introduced the IFTA crawlers a while back that pre-process this as data is retrieved. The interpolation process is quite simple if the vehicle was stationary, odometers should be steady between two parked records anyway. However, if you request an odometer for when a vehicle was driving, Geotab will look at the closest actual odometer reading, let's say that was 30 minutes ago (it's never more than 1 hour as they grab one every hour). Then, it looks at all the GPS locations received SINCE that point 30 minutes ago, and calculates distance travelled since then from GPS. Suppose we actually drove 20 miles in that 30 minutes, that's a GPS based calculation, and it's added to the latest odometer reading, and this is the interpolated value that is returned. It's really quite smart and accurate. To produce IFTA reports, Geotab uses shapefiles to detect jurisdiction changes, and automates the process of retrieving those interpolated odometer values for all these points.

This is not an official Geotab answer, and is based from information I've gathered over the years. More readings off of the ECM might be done now because of the ELD mandate, some logs might require additional readings, I'm not sure. And perhaps they've tuned the interpolation process, but this was how it was described to me in a post on the old forums a good few years ago.

Great info @LPPapillon-1145​ 

During some me test we perform two years ago, the odometer changes every 8 kms while driving and fuel consumption every hour

Cool, thank you so much for the detailed info, @LPPapillon-1145​!

@INACTIVE - Francisco Núñez​, good info here, too, thanks!

Best,

Joy @FleetNavSystems-1081