Does Scion Xd 2008 have enough room for 2 bikes?

[alien]

hello I have 2008 scion xd, I dont have a rack for the bikes and dont want to spend any money on it. My scion has 41.9 cubic feet of cargo, according to this website.
http://www.edmunds.com/insideline/do/Drives/Comparos/articleId=121117
Is it enough to fit 2 adult bikes?