How can the efficiency of an engine be increased?
How can the efficiency of an engine be increased? Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. The engine computer, acting in concert with the engine air flow sensor, electronic fuel injectors, and exhaust oxygen sensor, maintains the stoichiometric ratio for most of your driving. Which engine gives more efficiency? Diesel engines are still far more efficient than petrol engines at converting fuel to mechanical energy. In fact, including the energy advantage of the fuel itself, diesels are up to 40% more efficient at doing that. What is engine...