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Destination SoC vs RM

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Driving from Twin Falls, ID to Idaho Falls, ID, I stopped at the Twin Falls SC and charged until the Nav system said I had enough charge to continue my drive and would arrive Idaho Falls with 12% SoC. By subtracting the estimated distance from current RM range, I calculated I would arrive with 52 RM left. As I made the drive, my destination SoC stayed steady at 12% while destination RM continued to drop (current RM - distance to go). By the time I arrived at the Idaho Falls SC my SoC still read 12% but my RM range had dropped to 32 RM.

What's up with that? I thought SoC to RM was a simple ratio but it appears to be variable. Any ideas what's happening here?

TIA