There's a Sonic in Baltimore. If you're up that way, take 695 to exit 18B Randallstown. Make a right on to Liberty Road and go straight for around a mile. It'll be on your right hand side. (My mother lives up that way.)
There's a Wawa in College Park, a mile or so past Ikea. We need one closer in though, dammit.
I'd also kill for a Krispy Kreme closer in than Gaithersburg.
There's a Krispy Kreme in Dupont. That's closer than close.
Because this is an anonymous board, I will admit I'd like a Waffle House and a Cracker Barrel inside the Beltway for my waffle/pancake needs, and a Braum's for my ice cream fix.