The spray structure, droplet size and velocity measurements for various gasoline-ethanol blends from a 4-hole port fuel injector have been reported. Specifically, the spray structure and the planar drop size measurements were performed using laser-backlit imaging and PDIA technique at injection pressures of 0.25 MPa and 0.6 MPa. Data has been generated for gasoline, ethanol, and gasoline-ethanol blends containing 10%, 20% and 50% ethanol. The volume of fuel injected at each pressure, and hence the spray penetration, were found to be similar across blends at each injection pressure. Despite a considerable difference in the viscosity of the fuels injected, the droplet sizes were also found to be similar. This is contrary to the expected trend of higher drop sizes with increasing viscosity for a relatively constant surface tension value. It is believed that the design of the injector wherein four streams of liquid emerge from the nozzle almost parallel to the axis, and interact with each other resulting in a unique mode of breakup could be the main reason for the effect of viscosity not being strongly manifested. This observation has interesting ramifications for the utilization of this mode of atomization for other high viscosity fuels in low pressure injection applications.