Painting a house

Got a week and a half off, power washed the house monday and scraped the peels and spackled today, wife picked out the paint and I was ready to shoot tomorrow with my neighbors bad boy commercial paint sprayer. Forecast says rain Thursday! Glad I heard that....oh well, maybe next week. House was texture coated 20 years ago and the gray just isnt dark enough/faded for either of us. Bad thing about that texture coat is its gonna suck up the paint at $30 a gallon. Hope I can get away with 5 gallons. Single story ranch, 1250 sq feet. Double garage takes up almost 1/3 the front and its gonna get painted white as well as the trim and under the overhangs.