For Merc it's
- Germany
- USA
- UK (not far behind USA)
As regards tipping, these broad statements are, as so many broad statements, either wrong or based on prejudice and/or ignorance.
Americans might tip 15% because if they didn't (at home) they might have the staff turn on them.
In the 'Germanic' parts of Europe tips are just tokens to indicate appreciation, e.g. pay EUR 25 for a 23.70 bill.
In parts of Asia such as Singapore a tip is an insult.
DAS
For direct replies replace nospam with schmetterling