To answer most of your questions, it's Casey's breakfast pizza (bacon/sausage, egg, and cheese), it's delicious. No, soda (some of us call it pop) for breakfast is weird even for us. The lot is huge cuz a ton of people here have large trucks, RV's, etc. And yes that medium soda is huge
Yeah, I don't drink a lot of soda, but I love the big 32 oz cups, especially if the ice is very small or chipped. You fill it all the way with ice, then put in some lemonade or fruit punch, if it collapses any ice refill with more ice then continental filling. You now have a drink that will last you the whole day, with like 7 oz of sugar water in it.
Yeah, I'm from EU but love to do that when visiting family in US (in midwest...). The best is the ice from Sonic. Combine that with a corn dog, and you can again have hundreds of upvotes with a picture showing something Europeans don't understand.
My diabetes forces me to drink the sugar free options though, drinks with sugar are the worst poison for my body. Dr Pepper Zero was the best when I visited this autumn. And, to be honest, I never drink soft drinks when I'm back in EU...