Fuel efficiency display device for fuel cell vehicle, and fuel efficiency displaying method for fuel cell vehicle

A fuel efficiency display device for a fuel cell vehicle including a motor being a driving source of the fuel cell vehicle, a motor controller for controlling an operation status of the motor, and a fuel cell system being a power source for the motor,

• said fuel cell system including a fuel cell which receives reaction gasses and performs electrochemical reactions to generate an electrical power, and a power storage device which is charged with the generated electrical power from the fuel cell and a regeneration power from the motor,
• said fuel efficiency display device for a fuel cell vehicle comprising:
• a first interval vehicle efficiency obtaining device which obtains a first interval vehicle efficiency being a fraction of a generated traveling energy with respect to a consumed fuel amount in a predetermined first time-interval;
• a second interval traveling energy obtaining device which obtains a second interval traveling energy being a traveling energy generated in a predetermined second time-interval which is shorter than the first time-interval;
• and
• a second interval fuel efficiency obtaining device which obtains a second interval fuel efficiency being a fuel efficiency in the second time-interval, based on at least the first interval vehicle efficiency and the second interval traveling energy.