When you cruise at highway speeds, it holds the rpm nice and low for optimal fuel economy. (nissanusa.com)
Further contributing to quieter performance, as well as optimal fuel economy and emissions reduction, is the clean diesel's 2,000 bar common - rail fuel - injection system. (greencarcongress.com)
The result is an impressive reduction of NOx and root particulates, while reaching optimal fuel economy. (carsession.com)