Hi,
I have found at:
http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/html/I...
The documented location for grub.efi is set to /boot/efi/EFI/redhat/, however this is
changing for Fedora 18 to /boot/efi/EFI/fedora.
https://bugzilla.redhat.com/show_bug.cgi?id=893310
Chris Murphy