Well I don't fit in a regular seat on Alpie, but I fit on every coaster at SFA except Superman and Apocalypse. and It was close on Superman, but not close enough.
I'm big(ger) and I had no issue at SFA. Superman is probably the tightest but oddly not that uncomfortable for such a tight fit. Mind Eraser and Apocalypse I would avoid, even if you can technically fit on the ride - they're both very uncomfortable.
Superman will be the toughest if you have a wait over 40-42". Everything else shouldn't be a problem. I haven't seen to many people to make the walk on Apocalypse.
I have a large friend that has rode Batwing. They use to have a test seat for Superman but I'm not sure if it's still there or not. From what I understand it wasn't accurate and pointless.