Table S2 shows that there is significant linear correlation between payload and fuel
consumed per cycle and between cycle time components and the fuel consumed per ton
per cycle. Equation (S2) represents the model to predict fuel consumption rate from cycle
time components, ti, (in minutes) where component i is described by subscripts es, et, l,
ls, and lt, which mean empty stopped, empty travel, loading, loaded stopped, and loaded
travel, respectively.