ABRP uses to much mobile data more than any other app while I always drive the same route

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ABRP uses to much mobile data more than any other app while I always drive the same route.
It is the biggest using app on my iPhone (with Carplay).
764Mb over 8 days, while I always drive the same 54 kilometer over the same road.
My guess is the app does not cache the map but (re)loads it every time?