Here's a chart of most late model EVs tested against their stated EPA range.
The grey bars are the test results at 70 mph.
Since this was a highway-only test, one should only compare the grey bars against the yellow markers which are stated by the manufacturer.
The deviations you see are mostly due to how the manufacturer defines "highway speed", but the drag coefficient or "streamlining" of each design also matters.
How far an EV goes on one charge matters little on a daily basis if you have a reliable source of charging, whether near home or on the open road. For DC fast charging on highway trips in Canada, the advantage goes to the Tesla network which can average 10 times more plugs per site than any other network, but then there are 8 or 9 times the number of locations that have CHAdeMO/CCS for non-Tesla brands. However, most of these only offer only one plug at a time and one can never be sure if the station is functioning or not. This is quite a concern for most people who intend an EV to be their only vehicle.
To find DC fast chargers (or Tesla, or hydrogen for that matter), visit the following NRCAN link
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