I think what the person above you is talking about is not EPA range vs "real world" range. It is "car's estimate of remaining range before you have to recharge" and " real world remaining range before you have to recharge".

E.g., suppose the EPA range is 300 miles, you started from with a full charge, are 100 miles into your trip, and are at 1/2 charge. If what others have said is correct by default Tesla will estimate you have another 150 miles of range left (EPA range of 300 x 1/2 charge), whereas many others would say you have 100 miles of range left (you went 100 miles so far on 50% charge so if nothing changes the remaining 50% should give another 100).