Diesel autothermal reforming is useful in many strategic applications, where high energy density logistic fuels such as JP-8 diesel are reformed on-board to a hydrogen-rich syngas, which is further treated to be used as fuel in a fuel cell stack to produce electricity and waste heat. However, JP-8 and diesel generally contain sulfur, which precludes the use of most catalytic reforming techniques in field applications. Moreover, low efficiency, propensity for coke formation and reliability concerns need to be addressed before wide acceptance. The goal of this study is to explore the performance of a 10kW_e non-catalytic diesel reformer at reactant mixture conditions and to demonstrate the practicality of producing H₂ via non-catalytic autothermal reforming as an alternative to catalytic reforming. While we have achieved reformer efficiencies of up to 54% and carbon conversion efficiencies of 88%, a further improvements in these efficiencies can be achieved once a few remaining challenges related to fuel mixing and flame propagation are addressed.