Mitsubishi PHEV - Increase Your Highway Hybrid Gas Mileage?

Today's video is a test. What happens when you run the PHEV on the highway at highway speeds in SAVE mode with lots of battery. My theory is the car should be more efficient because the car still uses extra power as it is generated and with more battery power in the car there will never be a time when passing or going up a grade when you are completely out of battery to assist the engine. Lets find out what happens on a 300km trip.