Originally Posted by Majuki

Preauths are almost always the DCC amount even if the billing is correct. The only way to prevent the DCC amount on a preauth and put your mind at ease completely is to making the booking with an AmEx and switch the card at checkout. (I do this at hotels with bad behavior.) The same goes for some, but not all, purchases with DCC. For instance, the DFS machines will hold the non-DCC amount if you opt out, but others such as Francfranc or Disneyland will hold the DCC amount and post the correct amount.

In Hong Kong you're almost always protected for two reasons: 1) The currency selection typically comes on carbon copy paper of which you receive one copy and 2) merchants can typically reprint a courtesy copy of the receipt showing the final, correct amount.

Have you read that the other 2 local hotels did NOT DCC on their Preauthorized amounts? Only 1 out of 3 local hotels DCCed on the preauthorization.

I beg to differ. Just because you don't personally see it doesn't mean it doesn't exist. I'm actually surprised since Hong Kong is one of the locations with almost ubiquitous DCC deployment. While most honor DCC choices, some, such as Greyhound Cafe (or at least as of late 2014) did not.