Yamaha received the highest numerical score for EFI four-stroke engines in the proprietary J.D. Power and Associates 2008 Marine Engine Competitive Information StudySM. Study based on 6,973 responses, measuring 4 EFI four-stroke engine brands and owner opinions of 2006 and 2007 model year boats registered June 2006-May 2007. Proprietary study results are based on experiences and perceptions of owners surveyed September-October 2007. Your experiences may vary.