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To reduce the vehicle fuel consumption at high speed, it is very effective to minimize the aerodynamic resistance of the vehicle, which forms most of the vehicle running resistance at high speed. This paper presents a reduction of the aerodynamic resistance of van type truck through the wind tunnel tests using 1/5 scaled model. Firstly, the aerodynamically desirable cab shape for cargo type truck is investigated by changing main cab shape factors such as corner curvatures. Secondly, several effective attachments for Van type truck are investigated, and lastly, the effect of these aerodynamic improvements on the fuel consumption are clearified by vehicle running test.

Hino Motors had developed an electronically controlled mechanical automatic transmission and employed it for the ′85 models of large size buses, and also ′86 models of heavy/ medium duty trucks. This system gives minimum fuel consumption and even smoother/easier driving than an automatic transmission with torque converter, by controlling an engine also with a transmission and employing an oil spray clutch. The trade name of this system is EE-Drive which means easy and economy drive.