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OCR: 3) Near perfect (equal) distribution of fuel to each cylinder, unlike the carburator/intake manifold combination, which inevitably results in non-optimum mixture to some cylinders. 4) The performance improvement with fuel injection is substantial when these features are combined. A fuel in jected engine can both achieve superior fuel economy and performance, when compared to a similar, but carburator equipped engine. It should be noted that a disadvantage of both gas and diesel engines, whether or not fuel injected, in that they require relatively high quality fuels, and if the fuel is not completely clean, sophisticated fuel filtering systems are required, either at the delivery system (gas pump) or at the intake of the engine fuel pump or injector. Also, fuel injection systems are relati ...