Those cars come Brand New with the "original factory installed option of low mileage - 304 miles for each 310 miles advertised"
All that matters is the energy. That’s actually what is advertised (even though they give a miles number, a particular energy content backs that number up, and is all that matters, in combination with vehicle efficiency).
You could have 3 rated miles at 100%, and it would be just fine, as long as the energy checks out. The rated efficiency would be a little low (~25000Wh/mi!), but of course incorrect.
That unit is super important.
It's known that these vehicles show 304 rated miles (maximum) for the time being, but they show ~79.5kWh of energy at 304 miles per the method, so it's fine.
Use
the method and rest easy. Note that when it shows 79.5kWh, that is a MINIMUM value. It could be as high as 81kWh. 79.5kWh is the max it shows for this particular vehicle - that is the degradation threshold for 2024 Model Y Long Range at the moment.
Really? 304 miles is now "much lower" now? Less than 2% variance is reason to create a thread and get up in arms over? You know that's an estimate, right?
It really does matter, actually, if it reflects a reduction in energy or low initial energy. The miles matter, but
you have to know the units. The units can change. (Also
@PearlyMM did not create the thread...)
In this case all is well. 304 miles is in fact approximately equal to 310 miles, using 256Wh/mi as the unit for the latter value. If you denominate in 2023 units, the 2024 with 304rmi2024 actually has 79.5kWh/79kWh * 315rmi2023 = 317rmi2023!!!
So,
@PearlyMM, think of your vehicle as having 317 miles, in terms of 2023 miles.
(It's actually not this simple since the vehicles had different degradation thresholds, and the 2023 definitely typically started over 79kWh, but for the sake of argument. As far as we know the 2023 and 2024 have the same range when new (some uncertainty on the pack, covered below).)
Remember that rated miles are a unit of energy, and they are different for different models, and different model years. On rare occasions, Tesla will update the units after shipping the vehicle. That may still happen. The 2024 Tesla numbers don't show on fueleconomy.gov yet and when they do it is possible there will be an update. It may not happen, but it doesn't matter, regardless. I suspect it will, unless they adjust the advertised number down, which would be unusual. It will likely be retroactive to 2024s, but it may not be.
In general, this constant does not change after the vehicle ships, with exceptions.
There is still some uncertainty as to why the EPA test showed less energy pulled from this pack (79kWh) for 2024, than it did for 2023 and earlier (around 81-82kWh). Could be just a one-off test article difference.
2024 constant: ~262Wh/mi (screen line at ~267Wh/mi). For now. 2023 constant: ~251Wh/mi (screen line at 256Wh/mi). (Will not change)