Hey I know everyone loves some government organization to back them up to the T...check this:
Quote:
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Originally Posted by EPA
You can improve your gas mileage by 1-2 percent by using the manufacturer's recommended grade of motor oil. For example, using 10W-30 motor oil in an engine designed to use 5W-30 can lower your gas mileage by 1-2 percent.
Tips to improve your Gas Mileage |