It is a whole nother ball game if you plan to apply fertilizer as a liquid. And do not want to burn the grass. More important if the temp is over 80. In that case you need at least 2 preferably 3 gallons per thousand sqft. So you need to drive real SLOW so you cover about 1000 sqft per minute, say 1 mph.
Do it right--buy a Permagreen Triumph. Weed control sprayed. Fert as a granule.