Three minutes seems like a long time in terms of a signup process. Do you have to take all of this info during signup? Is it possible to give them an account w

Three minutes seems like a long time in terms of a signup process. Do you have to take all of this info during signup? Is it possible to give them an account without this info, then get them to add more piece by piece? Some game mechanics might help - e.g. showing them that their profile is 10% complete, and that completing X will add 10%, Y will add 15% and so on. Wrt your car question - something I see on a lot of sites is 'faceted navigation' - show them a load of results, but give them links to click in order to narrow down the info. When they click a link, you learn a bit about them (e.g. they want a blue car).