People’ Express, like Freddy Laker’s airline but to a lesser extent, also took it in the chops because of the gyrations of the forex mkt in 1985-87. Five Guys? No idea. They were not in my home town when I moved out of the US. I’ve no reason to think you’re wrong, though — premium-priced fast food is NOT a long-term winning business plan (as our fiends [no typo] at Chipotle are just about to learn, the hard way).
LOL, I went to Chipotle once and couldn’t stand them. Let’s just see how they do.