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I ran my engine out of oil a while ago( I had my gauges out and my oil sending unit randomly broke off), I started hearing a slight clicking sound along with what sounded like a large vacuum leak(probably the oil pump spraying the oil all over the firewall, but after I got the sending unit replaced the engine seems to run like it never happened. I don't know about the gas mileage question, usually when the o2 sensor fails mileage drops signifigantly( I believe I was getting aroung 20) but it's still a possibiltiy, whens the last time you has a tune-up and what all was replaced/checked?
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