1991 Ford Explorer Q&A

1991 Ford Explorer Question: gallons of oil

i just want to know how many gallons of motor oil i have to put on my ford explorer 91, v6, 4.0. -
Answer 1
Ford recommends replace the Engine Oil and Filter of the 4.0L V6 on your 1991 Explorer every 5,000 Miles or 6 months, whichever occurs first. Use 5 Quarts (1.25 Gallons) of SAE 10W-30. This number is marked on every oil container. More information about the 5,000 Mile Service at: http://repairpal.com/5000-mile-service -
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I have already changed the spark plugs and wires and replaced the the fuel filter. what else can cause the drop in mileage per gallon???