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a bad fuel pressure regulator can cause raw fuel to be sucked into engine thru a vacuum hose,also a bad map sensor will cause improper fuel mixture, a bad spark plug coil or wire causes a miss-fire in a cylinder will kill mpg, clogged air filter, engine vacuum leak.if tune up is way overdue do it complete and then go from there. have it checked. a overly rich mixture of fuel will wreck a engine and dilute your oil fuel is not cheap
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