Look at these articles. They've collected data for real-world range vs speed in various models, and how fast supercharging works in various situations.
Tesla Model 3 Performance vs RWD consumption - Real Driving Data from 233 Cars
There's plenty of data and test results out there. But range is very subjective. It varies hugely depending on driving style, speed, road surface, traffic, weather, temperature, tires, vehicles configuration/settings, etc.
Apart from going through r/teslamotors or Tesla Motors Club forums (plenty of personal reports on those), here is an aggregation of efficiencies for most Tesla model/wheel configurations at various speeds:
Given that Tesla track everything on every car - where they go, how they drive, when and how much they charge - they ought to have accurate data themselves apart from EPA ratings.
Could customers demand their own data from Tesla? Europeans, under the GDPR, for example? If enough people did, and released it, that ought to be accurate.
