I'm also curious about the Roadster's performance and range claims
On Tesla's previous record, I'd expect the peak performance to be exactly as claimed. The peak range, I'd accept as being true under absolutely optimised conditions that don't represent the real world at all. Give it to any normal driver and they'll struggle to achieve that.
And the range if you're making maximum use of the performance, well, halve it? The same is true for ICE vehicles, but if you've got a maximum potential range of 600 miles in your tank, then even if you're driving like you stole it, there's a lot more leeway to refuel than if your maximum battery range is 300 miles, and you're driving in the same manner.