I drive a Ford Focus (definitely on the compact side of cars) and it easily fits into my trunk and leaves room for extras (shopping bags, diaper bag, etc.). That said, the Focus has a pretty big trunk for a compact car. I doubt you'd have problems fitting the DSNG into any car though - it folds up pretty nicely.
Re: DSNG Question
well, it's kind of hard to explain something like that - i'm sure they have folded specs on their website....
but i can tell you it's going to be the smallest flat fold double you'll use.
what kind of car do you have?
it takes up less than 1/2 the 'floor' space in the back of our acura mdx.