Dear Fei Zhang
Sometimes not all information is displayed in the various softwares. It is always wise to access our website and look into ecoquery about relevant documentation. Load factors for passenger cars are found in page 91 of report no. 14. The loading factor of the “transport, tractor and trailer, agricultural” dataset is found in the documentation of the dataset itself. If you take the UPR (is the dataset before linking and allocation and is available on the ecoQuery but not in softwares) of a transport transformation activity dataset, the fuel input (or electricity) is the fuel consumption relatively of course to the reference product.
Data Analyst, ecoinvent