Congrats on receiving it! I got a red one coming just like yours. I also have an X5M and I feel (felt?) your pain. $120/week in gas. For Costco trips, even though it is a SUV it doesn't carry THAT much if you have two passengers and a car seat.
Based on my friends who have Model Ss, I should have more capacity than my SUV.
I'll likely be selling the X5M when the Model S arrives but I'll be sad. As you know, these M SUVs are quite fun!
Got a couple of calls just like that. They did honor the previous price, but the Plaid is still $30-40K more and while I don't have an issue with it, my wife would not be a happy camper.