Pros & Cons of Direct Injection- Pros                                                                                                                                                Cleaner CO2 emissions Has shown to decrease fuel consumption by 15% (howstuffworks.com) Increases power and torque across entire power curve auto.howstuffworks.com Cons More oxides of nitrogen in emissions, which is harmful to breath Audi claims cost would go up approximately 5% for an engine equipped with direct injection compared to a regular electronic fuel injected engine (howstuffworks.com) Due to extremely tight tolerances in injectors, they are very sensitive and  can become plugged if debris is pulled from the fuel tank Carbon buildup on valves can decrease power and cause engine knocking The History of Direct Injection            What is Direct Injection            Opening page            Bibliography