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Fuel injectors are electronically controlled by the ECU(computer) and cannot be adjusted by the consumer. There are 'PROMS' or 'CHIPS' available on the internet as aftermarket performance enhancements that change the injector pulse width therefore giving you better fuel economy by shortening the pulse providing the engine 'less' fuel or by lengthening the pulse with, giving the car more power, but also using more fuel.
ALWAYS look for a reputable company when buying PROMS. Do not fall for the O2 sensor modification that everyone is selling to increase economy on certain auction websites. It may actually do more harm than good. Get to be friends with a local mechanic if you can. They can quickly tell you if a product is worthwhile or a scam.
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