Calculated trip time from ABRP unrealistically short

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/report-a-bug/calculated-trip-time-from-abrp-unrealistically-short/
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Hi ABRP,
The route https://abetterrouteplanner.com?plan_uuid=09238976-37af-4fea-bacd-0d0c406bbf6d
compared to:
https://maps.app.goo.gl/kzvQVTys9j6ePjZf6
is exactly the same route but for some reason ABRP thinks I can drive this 28min faster than Google Maps thinks. And since I just drove the route yesterday, I know that the time Google Maps (and also the Tesla onboard Nav btw) calculated was exactly right. Also the SOC calculated on arrival was approx 8% less in ABRP compared to the Tesla Nav, which ultimately was right with even 1pp higher than initially calculated.
This is such a big difference, that I think it must be a bug in ABRP? Approx 60% of the trip is not on the Autobahn so 159km in 83min is just not realistic? Not sure if you have an idea why this is? Thanks!