With the epa combined 37 MPG gas only that's equal to 4,144 miles on the gas engine. Looks pretty typical for such a break in run on a new engine with the wear metals. Surprised no moisture present.

Good call on changing it by time.

The volt is rated to use 35 kWh/100 miles. So about 6,800 kWs used for electric. That is subtracting the 4,144 miles from the 23,662 run. Not sure what the efficiency of the charger is if you are figuring out the electric cost to the home.
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1999 Ford Taurus 145k (Vulcan v6) - Mobil 1 High Mileage 5w30 | FL400S
2002 Buick Century 102k - PU 5w30 / Fram Ultra XG 3980 / Filter mag