[mcguire]

Doesn't the key go missing often?

I'm reminded of European hotels that want you to leave the room key at the front desk.

[jermy]

They plug in to a socket in the glove compartment, and I don't think the rental is counted as completed until they are returned there. I'd naively assumed this was standard across the globe, but clearly there must be other factors to warrant not allowing you to remove the key.

On the other hand, the fuel payment card does missing - but at least Zipcar in the UK are efficient at refunding your own payment when provided with a receipt.