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When truck tires have a deformation such as radial runout, flat spot, and abnormal wear as a result of panic braking, they affect vehicle vibration in the form of displacement input whose spectrum involves higher order terms of tire revolution. While a truck has vibration modes of frame bending as well as pitching and unsprung-mass viberation in the input frequency range, the tire displacement input induces vehicle vibration as a combination of these modes. Results of calculations and experiments of a 4x2 medium-duty truck are analyzed and an example of means for improving ride comfort is described in this paper.

The basic variables of fuel economy are compared among some truck types manufactured by Mitsubishi Motors Corporation, and their contribution on fuel consumption is discussed. As for heavy duty trucks, whose fuel economy is the prime concern of all fleet operators, the design improvements of engine fuel performance, driveline power losses, rolling resistance of Lires, vehicle air resistance and curve resistance are described, and their influences on fuel economy are discussed along with test data and calculations. In addition to these parameters, conditions of the vehicle operation such as vehicle speed and payload are recognized to have a great influence on fuel economy of trucks.