Hi,
from Germany I'm used to round up my bill to the next EUR or max 2 EURs. I really have to force me to tip 15% in the States. I hate this system of tips and sales tax on top of the announced prices. If I have 20 bucks in my wallet and I have to choose something for about 15 bucks because of the hidden price increase. I like non tipping countries like Japan.
Thomas