There's a Sonic near me, and I've never been there. I'll have to try it!
It's funny, Casa Grande, Arizona is a fast food chain lover's paradise. It's not big enough to call it a city, but it's a big town located by itself in farm country. We have Culvers, In N Out, Whataburger, Sonic, McDonalds (3), BK (2), Jack in the box (2), Chick-Fil-A, Carls Jr, Wendys, Chipotle, Cane's Chicken Fingers, Long John Silvers, Popeyes, KFC, Churchs, Wendys, Subway, Firehouse Subs, Jersey Mikes, Jimmy Johns, DQ (2), Taco Bell, Arbys, Panda Express, and, I'll not bother listing pizza, ice cream, donuts, locals, etc. I'm not really a fast food lover, but there is something here for just about anyone. My weaknesses are Culvers and Chick-Fil-A.
It's insane. I mean, we are not talking about a big suburb of a big city. This is like a big county seat kind of place. Being on the interstate does add to the mix.