Roughly 24 miles trip, first 6 miles EV mode then last 18 mi hybrid mode. Just at the end of the trip maybe 1/4 mi left, I made a U-turn and started smelling very strong burning smell. Stopped at destination, opened hood to find smell emanating from the engine area. Upon careful inspection only clues are high oil level (up to top of orange plastic tip of oil dipstick), slightly high inverter coolant level, and low EV battery coolant level. I also added some coolant to engine coolant reservoir so it is maybe 3/4 to 4/5 (from min) to max level.
I adjusted the oil level to maybe 1 - 2 mm below middle point, added some coolant to the EV battery reservoir, which was a PAIN to get access to, and siphoned some inverter coolant to about or just below max level.
Will observe if smell returns as most drives are in EV mode, and follow up with my conclusions.