Only had my jku for just over 2 months. Dealer did oil change prior to purchase with OEM filter. During that time I was getting 20.8 MPG's. Last weekend I changed my oil. Used a full synthetic of the same weight, and upgraded oil filter. Since oil change gas mileage has dropped to 19.7...Could this drop be because of oil and filter, or a coincidence? Suggestions, ideas, or comments welcome.
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