Hino engines enjoy top customer satisfaction among medium-duty truck owners, according to the J.D. Power and Associates 2008 study in the US. The research company says the study measures customer perceptions of 2006 modelyear petrol and diesel engines, and provides manufacturers with a measure of customer satisfaction with the products. Hino ranks highest in customer satisfaction with a score of 794 on a 1000-point scale. Mercedes-Benz (758) and Caterpillar (748) follow.