[pifm_guy]

If you buy anything online (in Europe at least), you can return it for a full refund within 14 days if you don't like it.

[badpun]

They would probably refuse to take it back if you've driven it. Whereas in dealership, you can take a test drive.

[oarsinsync]

I think the online car sales like cazoo and cinch give you a 3 day 100 mile test drive window where you can return without question if you don’t like it.