A novel fuel savings scoring system is capable of analyzing real-time on-board diagnostics (OBD) information of a vehicle from a remote monitoring station unit. The fuel savings scoring system can derive a novel fuel efficiency comparison metric called “driving score.” Preferably, the driving score represents a commercial vehicle driver's fuel efficiency driving performance relative to those of peer commercial drivers in a commercial vehicle fleet organization. The driving score takes account of a current real-time mileage achieved by a particular vehicle as well as the best empirical mileage achieved by the same make and model to the particular vehicle in the commercial vehicle fleet organization. Furthermore, in some embodiments of the invention, the driving score for the particular vehicle can even be route and traffic condition-sensitive, which further improves the realistic usefulness of the driving score as a comparative fuel efficiency driving performance measure among commercial vehicle drivers.