Operation of polymer electrolyte membrane fuel cells (PEMFCs) with dry feeds is demonstrated to depend on the gas flow field design, gas pressure, temperature and flow rate. We demonstrate auto-humidified operation of the channel-less, self-draining fuel cell, from 25 to 115°C. Traditional serpentine flow channel designs cannot sustain autohumidified operation above 60°C. Auto-humidified (or self humidifying) PEMFC operation is improved in the channel-less fuel cell where axial dispersion enhances "back- mixing" of the product water with the dry feed. The auto-humidified self-draining fuel cell design offers substantial benefits for simplicity of operation and control including: the ability to self drain reducing flooding, the ability to uniformly disperse water removing current gradients and the ability to operate on dry feeds eliminating the need for humidifiers.