I was talking to a taxi dispatcher at some function here in Canada, and it came up that each vehicle on the road would drive about 500km/day. That's about $200-$250/day in what the per distance rate many employers give out(40¢-50¢/km) for fuel and wear on vehicle. But assuming an 22hrs of driving a day(on a taxi with multiple drivers), that's about 22km each hour or $11/hr for fuel and wear on the vehicle according to what many employers would pay in addition to time driving. This is in Canadian dollars, so $11/hr is about $8/hr in USD and works out to an average of $16USD/hr of driving(assuming (22km|13miles)/hr average)