Who are more likely to be killed passengers or drivers?

It depends on the direction and severity of impact in an accident. If a car is hit on the driver's side, obviously the driver is in more danger. If the passengers and driver are all belted in equally, the front riders may have a greater level of safety due to the presence of front airbags. This includes the driver.

The driver is close to the steering wheel, so this is a greater source of injury for the driver. But I do not know what fatality statistics from the steering wheel alone are.