Three hundred miles a day? For fifteen days? I just can't. I typically do 300 miles before lunch. So, I've backed up my departure to Wednesday, June 16th. It only adds a ~1,000 mile average to the entire twelve-day span, but I can ride a little longer each day with the option to stick around if I like a particular spot, but without the prospect of getting to Tahoe "too soon" and having to kill time.
Look for the GPS map updates to start populating sometime Wednesday morning. As a reminder, you can follow and message me through this link.