A friend of mine is claiming that fuel economy can be improved if car is frequently being put to neutral while driving. His non turbo 850 with automatic transmission uses 7.8 l/100km (30MPG) on a highway. My question is if this is really a known fact and can be scientifically proven for or against it. Is this ok practice for the transmission or other parts. I'd like to know what impact this has on the 850 with automatic transmission, if any, and if this driving habit really saves gas. I would leave discussion about safe driving, legal issues for another topic. Thanks for your suggestions.