From all the information I've seen a 15% tip is appropriate for a taxi ride.
Early this morning I took a taxi from Paris Casino to the airport. The fare was $10.50, and I added (15%) $1.50 for a total of $12.00.
The driver went into a tirade, saying that I had to give a minimum of $2.00 and ultimately called me a piece of s--t. I just wanted to get away from him, but should have copied the license number down.
Anyone else ever have a similar problem.
[PS: I had only two small carryon's which he did NOT have to help me with.]