I discovered Sonic while doing an internship in Texas (as well as Cracker Barrel). Love Sonic bacon/cheese burger, a diet buster, and tater tots.
Then returned to CA, don't think they are anywhere in central valley.
I was housesitting for a friiend in southern Oregon year ago, a Sonic opened off the interstate, people drive in from miles around to it.
Sonic ads on T.V. piss me off. The closest one to me is 90 miles away and everytime I see a new commercial I want one of those burgers or drinks so damn bad.