A primary reference fuel of 80 octane number (i.e., 80% C8H18 and 20% C7H16 on a liquid component volume basis) is tested by using 10% excess air. Determine the volume of air needed per kilogram of fuel at 303 K and 87 kpa as well as the mass of fuel to air ratio. Take the density of the liquid fuels to be 0.75 kg/L.