After the service, I took a look at the fluids in the car. There is a tank marked coolant with F and L marks on it, and the the level of fluid in this tank was (significantly) below the L mark - it looks like there are about two cups total at the very bottom.
This means that you can book a round-trip ticket to Hawaii from anywhere Delta flies in the US, Canada, Mexico, Puerto Rico, or US Virgin Islands using Korean Air miles for only 25,000 miles in coach or 45,000 miles in Business Class.
Hawaiian Airlines has 3 mileage price levels for each class of service, and only flights at the lowest price level are available for booking via partner miles and points. So when you get results, keep an eye on flights that are 20,000 miles in Economy Class and 40,000 miles in Business Class.