Class-8 Heavy Truck Duty Cycle Project Final Report - Center for ...

Frequency
350
300
250
200
150
100
50
0
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00
Fuel Efficiency [mpg]
Fig. 80. Distribution of Fuel Efficiencies Computed for 100-mile Segments, All Trips with NGSWBTs
Mounted on the Tractor and Duals on the Trailer: Heavy Load Case
Frequency
160
140
120
100
80
60
40
20
0
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00
Fuel Efficiency [mpg]
Fig. 81. Distribution of Fuel Efficiencies Computed for 100-mile Segments, All Trips with NGSWBTs
Mounted on Both the Tractor and the Trailer: Heavy Load Case
Fig. 82 and Fig. 83 show sample duty cycles for two randomly selected 100-mile segments
corresponding to the Duals-Duals and NGSWBTs-NGSWBTs tire combinations, respectively, for
vehicles carrying medium loads. The fuel efficiencies calculated for these two 100-mile duty cycles
correspond to one observation of the distributions shown in Fig. 78 and Fig. 81, respectively. The
first duty cycle (Fig. 82) shows mainly maneuvers around a parking area while the second one is a
duty cycle that combines freeways and surface streets. The fuel consumed during these real-world
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