On a first day was colder and the bike was used first time by our colleagues: mostly uphill and they haven't nail it how to recharge going down hill. They did 70% what we didi and they end up with 2% power left. We used one gas tank by the time they were done. On a second day I played much more on a sections and burned one gas tank (1.9 litre) they had 75% power left. They also figured out how to recharge bike on a way down. I think all depends from terrain and temperature.