Driver mentoring to improve vehicle operation

A system and method for mentoring a driver of a vehicle can include a monitoring device in communication with an onboard diagnostics unit coupled to an engine, the monitoring device monitoring at least one of a plurality of vehicle parameters received from the onboard diagnostics unit including vehicle speed, fuel level, engine speed, load, mass air flow, manifold air pressure, and odometer reading, and using the at least one of a plurality of vehicle parameters to calculate a fuel efficiency and/or emissions of the engine; and an output coupled to the monitoring device, wherein the output notifies the driver when the fuel efficiency changes. The output can notify the driver when the fuel efficiency and/or emissions increases or decreases. The notification can be visual, audible, or a combination of the two.