The express type buses do have 110 outlets.
There's no Greyhound buses in the HKSAR
Some newer Greyhound buses are equipped with power jacks. You won't know till you see the bus. Other companies like Megabus and Boltbus (the latter of which is owned in part by Greyhound) do offer connections and wi-fi service on all buses.
No, Greyhound does not have assigned seating on their buses. Seating is on a first-come, first-served basis.
The gate designated for Greyhound buses at the Port Authority is Gate 84.
Greyhound buses differ from school buses in many ways. A Greyhound typically has a much nicer body, reclinable seats, on board bathroom, smoother ride, more space, and even television sets.
Greyhounds. (???)
Greyhound
The gates designated for Greyhound buses at the Port Authority are typically located at Gates 401-409.
The greyhound gates at the Port Authority are used for boarding and departing Greyhound buses.
One can find the bus fares for Greyhound buses on the Greyhound website. If one changes their travel plans after purchasing tickets one has to pay a $20 fee.
Some do and some don't. It all depends on the company and/or the amount of money you are willing to input. Some only have power outlets in the bathrooms though. You would just have to research the company
4 buses a day