It's not big, but it is clever. Toyota's iQ city car is just three metres long, yet can carry two adults and two small children – and it's very well equipped. It's at its best around towns, where its compact size makes it easy to park.Running costs are low, but if you intend to rely on the iQ as your only car, think carefully about the kind of trips you make. You have to choose between passenger space or luggage space – you can’t have both. Also, the iQ feels a bit out of its depth in fast-moving motorway traffic.