It appears my fears panned out and the oil change service is tied to the tire rotation and probably set more for a hybrid or full gas car service interval rather than PHEV. I am nearing 13,000 miles and it just indicated service A01 is due (oil/rotation/inspection). I have used only 48 gallons of gas since the last oil change, which is very premature, about 2,000 engine miles at a reasonable mpg. Car should easily be good for about 150 gallons gas burned between changes when the engine is run regularly. My first A01 indicated at 6,000, but was done at 7,000 due to a trip we started right after indicator popped up. Seems like in our use case it runs about 6,000 mile interval.