2002 F150. 5.4 2v, ~150,000 miles on engine. 1 qt every 1000-1500 miles.
2004 F150, 5.4 3v, 177,000 miles, 1 qt every 2000 miles.
2010 Hyundai Santa Fe, 2.4, 176,000 miles, 1 qt every 4000 miles (7,500 mile OCI)
2012 Scion xB, 2.4, 53,000 miles, 1/2 qt every 5,000 miles (engine know to be an oil burner, keeping an eye on it). Never have to add since I change it at 5000 miles.