Sonic opened its Rio Grande restaurant on Tuesday, according to an e-mail I got late yesterday from their corporate folks. It looks very interesting, and very colorful, with all these separate bays for driving up to and eating while in your vehicle. There's also an outdoor seating area. I'm going to check it out in the next couple days and update this blog. Let me know about your experience there; send to seitz@catamaranmedia.com.