Patent ID: 8655527

Claim:
A fuel-saving driving diagnostic device that diagnoses fuel-saving driving of a vehicle that has an internal combustion engine for driving the vehicle and an electric drive device for driving the vehicle using electricity as energy, comprising: a control value acquiring unit that acquires a control value based on a driving operation performed on the vehicle; a first eco range output unit that outputs a first eco range that indicates a relationship between an upper limit threshold value of the control value and a vehicle speed of the vehicle, the upper limit threshold value of the control value being a boundary between eco driving and non-eco driving with respect to the entire vehicle; a second eco range output unit that outputs a second eco range that indicates a relationship among an upper limit threshold value of the control value, performance characteristics of the electric drive device, and the vehicle speed of the vehicle, the upper limit threshold value of the control value being a boundary between eco driving and non-eco driving with respect to the electric drive device; a determining unit that determines whether the control value acquired by the control value acquiring unit is within the first eco range, and determines whether the control value is within the second eco range; and a presenting unit that presents a result of the determinations made by the determining unit with respect to the first eco range and the second eco range.