From the emirtaes car page (you need to call):
[TABLE="class: displayTable, width: 765"]
[TR]
[TD="class: detail first, bgcolor: #EDE9E0"]Hong Kong (HKG)[/TD]
[TD="class: detail noLeftBorder, bgcolor: #EDE9E0"]No mileage restriction.[/TD]
[TD="class: detail noLeftBorder, bgcolor: #EDE9E0"]Chauffeur-drive service is offered to First Class passengers only. Please contact your local Emirates office if you wish to book this service.
This service is not available in areas requiring special entry permits (e.g. Ma Wan, Discovery Bay or Huangang control point) or crossing Hong Kong Special Administrative Region borders (e.g. Shenzhen). In addition, it is not valid for flight bookings between Hong Kong-Bangkok and vice versa.[/TD]
[/TR]
[/TABLE]