Wrong, and wrongcwerdna said:This is exactly why I said this is Tesla-centric. You're using an unpublished constant
Every car has an EPA value that is published. Tesla uses that value to calculate RM, others hide theirs.
Tesla also shows the the EPA value as a dotted line on the energy consumption screen.
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Is it useful ? Exactly as useful as reporting usable kWh remaining, which is valuable information to some people.
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Tesla also has different GOMs built-in. The one that estimates destination SoC is outstanding because it takes into account current consumption rate, vehicle speed, road speed limit, future speed limits, and topography. On my trips the destination SoC estimate has always been within 1-2% of actual. Amazing, really. I presume the last bit of inaccuracy can be solved with wind data.