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This paper derives a parametric equation for predicting the fuel economy of on-highway heavy-duty trucks. The accuracy of this equation is compared to actual vehicle MPG results. Based on this equation, the relative importance of the numerous parameters which affect the fuel economy of on-highway heavy-duty vehicles are calculated and discussed. To illustrate the value of this methodology, the development of the newest Freightliner EnergySaver package is described and the results from a cross-country fuel economy test of this package are presented. Using these same methods, the future for increasing on-highway heavy-duty truck fuel economy is explored.

A system for analyzing results from vehicle pass-by noise tests is presented. Features of the system include data telemetry, narrow band frequency analysis, order analysis, portability and efficient data management through the use of computer based data reduction and display graphics. The system has been implemented and utilized in a development program for reduction of noise emissions from heavy-duty diesel trucks.

Since the introduction of the Freightliner/Wabco individual wheel control ABS in 1987, both Freightliner and Wabco have continued their efforts to develop a simplified and highly cost effective ABS for use on Freightliner vehicles. This ongoing development effort has lead to the 4-channel Freightliner/Wabco Tandem Control ABS. This new Freightliner/Wabco Tandem Control ABS was introduced in 1989 as an alternative to the original Freightliner/Wabco 6-channel individual wheel control ABS for use on typical 3 axle, on highway, tractors and trucks. This paper describes the advantages and the differences between the Freightliner/Wabco 6-channel individual wheel control and the Freightliner/Wabco 4-channel Tandem Control ABS when installed on 3 axle Freightliner vehicles.