Yes, exactly but I'm still skeptical. We don't know if the 30 cars they delivered were the long range version. Even if they were, we don't know what the window sticker shows. Maybe it shows a different number than 310.
At this point people might say, it's not like Tesla is going to advertise 310 miles on the website and keep quiet about the EPA rated range until somebody takes a photo of the window sticker and posts it on the Internet? Yes but that is exactly what happened with the Model S P85D.
When Tesla released the Model S P85D, Tesla's design studio showed "275 miles range at 65 mph" (
source). People configured their car, paid their deposit and started waiting for delivery. Tesla didn't say anything about EPA rated range. Eventually, somebody spotted a P85D parked in front of a Tesla building waiting for delivery and took a photo of the window sticker.
Here is that photo. It shows 242 miles EPA rated range.
Here is a news article about it. This was a big shock to many people.
I'm not saying the 310 miles number is not EPA rated range. It might be but I find it interesting that they don't mention EPA rated range next to the 310-mile number and we don't know the battery size either.
My calculations from a few months ago showed 218 mi EPA for Model 3 55 and 285 mi EPA for the Model 3 75. I don't understand how I was only 2 miles off with the Model 3 55 and 25 miles off with the Model 3 75. Of course, it is possible that the battery sizes are not 55/75 but something else, maybe 60/85 like Motor Trend estimates. We don't know.