this website tells me the difference between a gas engine and a electric motor.this will help me in my project by telling me how much electricity it uses in a regular ride and how much a gas motor burns on a regular ride. In this website a regular ride is two km by the last paragraph of the website it says the gas motor would obviously last longer because electricity burns faster than gas but at the same time your polluting with a gas motor so whose really lasting longer. I think this will be and great help in my project and be a great website to look further on.