Technique for calculating distance to empty in electric vehicle

A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

• program instructions that calculate a past driving average fuel efficiency;
• program instructions that calculate an air conditioning average energy consumption rate during at least one past driving cycle;
• program instructions that calculate a past driving average fuel efficiency which assumes an air conditioning apparatus is not used from the past driving average fuel efficiency and the air conditioning average energy consumption rate;
• program instructions that calculate, a current driving fuel efficiency;
• program instructions that blend the past driving average fuel efficiency assumes the air conditioning apparatus is not used and the current driving fuel efficiency;
• and
• program instructions that calculate the DTE from the blended driving fuel efficiency