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Speaking of the taxis, since I don't have a car (until I get the model S), it's train, bus, taxi, helicopter, walking, running or cycling for us. Since about a month or so, we have only taken taxis of the electric version (for any longer drive than ~50 HKD). As far as I know, there are no formal way to call one of the ~45 BYD e6 taxis, but we have three different mobile phone numbers we can call, and they will inquire within to get us a charged drive. If not available, they can get us an ordinary LPG taxi. PM me for access to these phone numbers, though I must say, Cantonese language skills are a plus!
While you are waiting for your MS, if you like to try a BYD e6 electric car, I now have a number for an English/Cantonese speaking taxi driver, Albert (6627 5744). He will mainly do trips of 150+ HKD if you call him in advance, and he is connected to a handful of other BYD e6 drivers as well in case he cannot make it. He will offer a discount on request, and contrary to many taxi drivers in HK, he is driving quite comfortably.
Besides the 45 taxis, there is presently one privately registered BYD e6, according to Albert. The price is around 400K HKD, but the taxi drivers mainly rent them, because that way they get free electricity. If he bought instead of renting, he would have to pay for electrons himself. Albert used to be a manager in a hotel, but he enjoys driving a taxi much more even though the pay is less. Very pleasant to talk to, so there you have it, go try the BYD e6 if you need to take a taxi anyway