8.5 for the first 500 miles is common. It should start ticking up after that. I am now at 7800 and still getting better mileage every tank full. Several are above 10,15,and 20K and are still improving.

Your power will improve as well. It doesn't make since but it is as though the computer is programed to detune the engine below 500 miles and then gradually increase power at 500, 1000, and 5000 miles. Several of us have noticed power increases around these mile markers.