International audienceThis paper deals with the optimization of the fuel consumption for a city bus of the city of Rouen, in France. This work takes part from the ANGO project, a french PREDIT-ANR project. The aim consists in modelling the bus and its fuel consumption in order to formulate a problem of optimmization of the consumption (criterium definition, constraints, initialized variables, ...). Some simulation results are shown under an advisory system to the bus driver and experimental works are presented