Took our first trip in our new rv and traveled about 800 miles. Our fuel mileage was 7.25 MPG. We were not towing anything and it was just me, the DW and our dog Scout. We were not fully loaded, fresh water full, holding tanks empty. Is this normal or will it improve as it gets broken in? Plan on changing to full synthetic and new air filter at 3,000 miles. Currently we have only 2200 miles on the clock.