In an aspect, a fuel economy of a vehicle is determined by: receiving telematics data produced at least partly by one or more sensors at a vehicle; identifying, based at least partly on the telematics data, one or more fueling events of the vehicle; determining, for each fueling event of the one or more fueling events, an amount of fuel added to the vehicle for that fueling event; and determining, based at least partly on the amount of fuel added to the vehicle for each fueling event and the telematics data, a fuel economy of the vehicle.