I'm looking to replace a too big, too heavy Johnson 85 hp (1973) on my 16 ft glass runabout. About where in model years do we start to see a higher fuel efficiency in the OMC line of 50-70 hp models? Would like to get something less thirsty and ligher for this rig. Any suggestions about side and model year? Also how are the 1999 and 2000 2 strokes in terms of pollution compliance and effiency?