I know that it is not the custom to tip local taxi drivers when there is no help with luggage. My husband and I always tip the Uber or taxi driver when we have bags. However, we are having a disagreement about tipping the driver of a premium car service (such as Miramontes). He thinks that since we are paying more (600 pesos for a van to the airport) a tip is not required. I think that since it is a service industry, there is an expectation of a tip, and the driver might not necessarily be getting paid more just because the rate is higher. Please weigh in!