Elliptical question

Sunsama

So I have an InMotion Elliptical at home. It's the kind you have to balance on without the handlebars, and has a smaller stride than the ones you see at the gym. I've been keeping track of the distance it displays on it, and I thought that it was in a distance other than miles, as the number always seemed high. I pulled out the manual just now to check, though, and it says it's in miles, so now I'm just confused. 30minutes on this one will give me 16miles, but an hour of intense *kitten* kicking at the ones at the gym will only give me 6??? Anyone know anything about this?