Quality is everything
Recently i had the opportunity to experience In-N-Out http://www.in-n-out.com/default.asp twice in a span of two days. Since I know they emphasize food quality and pride themselves on following old-fashioned ways and sticking to high standards, i was fairly certain i wouldn't have to worry about HFCS.
The only question i had concerned the "special sauce." And maybe the milk shakes.
So, after I got home i decided to google to see if In-N-Out products contained HFCS. A while ago I researched their hamburger buns and found that they are baked fresh daily and no cause for concern. But I just couldn't find specifics about the "special sauce." So I wrote to them via their "contact us" link.
The reply came within a few hours but only included a phone number; HOWEVER, upon dialing, they answered after one ring and it...... was a real human who answered (no joke). Not a recording or machine with options or third party in Pakistan. AND they quickly listed their menu items containing HFCS: yes, the special sauce; and yes, the milkshakes; and also the lemonaid. But that's it!
So, bottom line: In-N-Out has a smaller ratio of menu items with HFCS than any other chain other than Jason's!