I have a *LOT* of experience of this. I've driven about a thousand hire cars in the past and each time I've had one, I've tried to get a bike in the boot to take away with me. Plus my own car experiences.
Here we go then.
**** awesome.
Mondeo – A1 rated!!!!!!!!!
Audi A4!!! Surprisingly.
Passat
Honda accord saloon (this is my current car, I've had three bikes in this one)
Hyundai mk3 coupe (MASSIVE boot space with the back seats down)
MK3 Astra (with the seats down you can get 4 bikes in easy.)
Zafira – I think our record was 5 bikes, 4 people and a load of bags. It's like a Tardis.
Not so good
Insignia
New Astra
New Focus
Damn poor
All cars made by frenchies, even the peugeot estate was small in the boot area, quite impressive how they managed it to be honest.
Audi A3
Golf