ill be honest.... i have ZERO supporting evidence for what im going to say. But dont waste your money. A Factory tune is the most reliable for most situations. Manufacturers like Honda spend millions in engine design and development all while trying to achieve optimal characteristics to provide both power and fuel efficiency.... My first hand recommendation , is monitor the real time fuel MPG meter and practice throttle control. When at a cruising speed, back off the pedal just enough to maximize efficiency while retaining constant speed. Cruise control DOES NOT do this..... you must do it yourself. Its a game i play everytime i drive, or just press the damn eco button and be done with it.... anyways How efficient will you be next time? LOL .... idk im bored at work