In restaurants the standard gratuity is 15% to 20% of your bill. Many restaurants automatically add a 15% to 20% gratuity for groups of six or more.
Tip taxi drivers 10%–15% of the fare, and airport and hotel porters $1–$2 per bag. It's also usual to tip chambermaids $2 to $3 daily. Hotel room-service tips vary and may be included in the meal charge. Masseuses and masseurs, hairstylists, manicurists, and others performing personal services generally get a 15% tip. Tour guides may be tipped a few dollars for good service. Concierges may be tipped anywhere from $5 to $20 for exceptional service, such as securing a difficult dinner reservation or helping plan a personal sightseeing itinerary. Theater ushers, museum guides, and gas-station attendants generally do not receive tips.