Excellent article. We have our reservation in for the S Model w/ big battery. It's clear to a lot of us in the queue, I'm sure, that one would have to baby the go-pedal to go 300 miles. I'd always assumed that if I got hold of the right person at Tesla I'd learn the range at normal freeway speeds. Is it possible that nobody there knows the answer? I doubt it. Could be a corporate lie that you heard.
I could live with 225 at 75. Most of our driving, even on overnight weekend trips,will be on two-lane country roads. Perhaps there, range will be close to 300. We could easily make Mendocino from the Bay Area where we live. Just take Hwy 1 the whole way - slow and easy. But I'd sure like to know the real range. We also visit SoCal a lot.