||There is an ever-increasing role of simulations in understanding complex systems such as the combustion occurring during operation of industrial flares. Extensive research, both experiments and simulations, has been conducted for simplified flares in well-controlled environments. However, experimental, as well as computational, studies of full-scale flares present great challenges when characterizing the effect of operational and environmental parameters on the combustion efficiency of full-scale flares. Often, for the full-scale flare studies, the experiments themselves, along with the instrumentation, can be very complex and expensive, and can be very difficult to characterize in terms of accuracy. For simulations of full-scale flare operations, computational resources can impose significant restrictions on the models, and their associated accuracy, that can be used to represent the system. In this paper we focus on the air-assisted flare experiments from the TCEQ 2010 Flare Study and compare the local combustion efficiency as measured by the extractive probe to the overall, global, combustion efficiency for a given experiment using both Reynolds-Averaged Navier-Stokes (RANS) as well as Large Eddy Simulation (LES) models. As such, we illustrate the role of simulation in determining combustion efficiencies of flares to help with safe and responsible development of combustion systems in the 21st century.