I used to put my 53cm road bike in the trunk of my '98 Integra for traveling. I had to remove the wheels, of course. And pull the seatpost--the front-to-back depth was a little to short to keep the saddle on the bike. The seats didn't fold, so this was all in the trunk.
Cars are a little bigger now.
So I think the back seat width should work. But you might have to take off the rear rack, and perhaps the seatpost.
Bring something to cover the car's interior, and some foam or a stack of old towels to pad the bike's corners.
A 98 Integra:
