We had to trick our way true carbon emission testing , we build in a potential meter to tweak injector opening time . At the minimal time it is as efficient as a Prius , no power and almost co2 neutral . Government regulation doesn't want me to enjoy a historical high tech mechanical wonder , some city centers already have banned cars from a certain age . While i can taste the kerosene from the planes of the roof of my car ;-) , i live near Schiphol airport .