The published Holding Speeds for Jet aircraft closely approximate Vmd, and this should be close to your optimum gliding speed if (God forbid) you should ever have to do an engineless glide.
Yes
paulo, we used to practice it in the Sim, about 10,000 feet over the top of the field was about right for a successful mini-circuit and glide approach. The advent of ETOPS has made it Politically Incorrect to now consider such a scenario
Regards,
Old Smokey