Hino Trucks engines rank highest in customer satisfaction among conventional medium duty truck owners for an unprecedented third year in a row, according to the J.D. Power and Associates 2010 U.S. Medium Duty Truck Engine and Transmission Customer Satisfaction Study.

The study, now in its third year, measures customer perceptions of 2009 model year Class 5, 6 and 7 gasoline and diesel engines, and provides manufacturers with a comprehensive and objective measure of customer satisfaction with the products and related dealer service. Eight factors are measured to determine overall engine satisfaction and include: engine reliability and dependability; accessibility to components for service/maintenance; engine warranty; engine control module (ECM); maintaining speeds on grades; average fuel economy; vibration at idle; and acceleration when fully loaded.

Hino Trucks engines rank highest in customer satisfaction for a third consecutive year with a score of 822 on a 1,000-point scale and perform particularly well in engine reliability and dependability, average fuel economy and accessibility to components for service/maintenance. Paccar (774) and General Motors (769) follow Hino in the rankings.

"Hino continues to satisfy its owners by focusing its efforts on the most important aspects of customer satisfaction and maintaining high quality in their engines," said Todd Markusic, senior director of the commercial vehicle practice at J.D. Power and Associates.

The study found that there is an annual cost difference of about 18 percent between those medium-duty truck engine makes with the highest gas mileage and those with the lowest. This may translate into an annual savings of approximately $2,100 per truck - or $36,000 annually for a fleet of 17 trucks (the average number of trucks per fleet).

Engine makes with the highest reported gas mileage average 9.3 miles per gallon, compared with the industry average of 8.4 miles per gallon. Further, more fuel-efficient trucks typically score 50 points higher in overall engine satisfaction (based on a 1,000-point scale) than trucks with lower fuel efficiency.

The study also found the following:

• Among the 27 percent of customers who experience an engine problem, satisfaction is 126 points lower, on average, than among those who do not experience an engine problem (661 vs. 787, respectively).

• Ten percent of customers indicate experiencing a fuel problem. On average, satisfaction among these customers is 134 points lower than among those who do not experience a fuel problem.

• Customers indicate that engine problems caused one unscheduled period of downtime, on average, during the past 12 months. During these periods, downtime averages approximately two days.