The answer to this question is NO for the HCHII.
But I think it's also the same answer for the Acura CSX. (For my american friend, most of you already know that but a CSX is a more than fully equiped Honda Civic available only in Canada.)
I was only able to put 2 in the trunk and the 2 others where sitting on the back seat.
May be this might help you to convince your other half:
Mostly driving to work everyday in traffic condition + city driving.
If you speak french, you can PM me for more information.
My current tank, and still not empty.
