Something else to remember is to at least allow 2,000 to 3,000 miles to allow all the parts to break in and seat before calculating the MPG. I change my oil and filter w/ Mobil 1 5W30 at 1,000 miles in all my cars to remove any flakes/dust/etc that comes off in the beginning of the break-in process. I then change the oil/filter at 5,000 miles and every 5,000 miles thereafter also with Mobil 1 5W30.
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