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Various sources of uncertainty exist in current on-road emission and energy consumption modelling approaches, which could affect the evaluation of energy and power distribution systems and related policies. These uncertainties are ever more pertinent today as urban transportation systems undergo drastic changes. This study presents a greenhouse gas emission and energy consumption accounting approach for on-road transportation, developed to estimate well-to-wheel emission distributions for household gasoline and electric vehicles, while capturing specific sources of uncertainty in the modelling process. Using data for Greater Toronto and Hamilton, the combined effects of vehicle electrification and well-to-wheel emission uncertainty were investigated. Under the base case, and for the study years 2011 and 2017, mean values for daily regional greenhouse gas emissions from household transportation …