I just made a trip from San Jose to Buena Park in Orange County.

Total Distance: 376 miles.
Time including Dinner: 7:30
Vehicle Load: 2 Adults and 2 kids for 1 week trip.
AC set at 72 degrees for the entire duration.
External temp was near 80 at start going to 97 about mid point to 80 at the end.
Fuel Used: abotu 2/3 tank.

1st Hours
85 S to 101 S to 152 East = ~60 miles Speed 55MPH 53MPG
5 S to Baskersfiled = 4 hours = about 250 miles Speed ~80 44MPG (cumulative)
Baskersfiled (up Grapevine at ~70-75MPH) - 40MPG (cumulative)
Magic Mountain to 405 S - ~60 miles - 42 MPG (cumulative)
405S to Buena Park ~60 miles - 43MPG @65MPH

Overall - 43MPG

It was pretty good trip. I have made this trip about 50 times in last 10 years in variety of cars, Taurus, 525, XG350, Villager Minivan, Santa Fe and now HCH II. I did not notice any lack of performance - just got little concerned going up Grapevine since Tach was about 5000 RPM but overall very pleasant drive. Engine Temp never went near 50%.

Tire pressure 42 front and back.

Initital impression was that CC was not as efficient as manual speed control, since it did not kick in Assist as much. I used as much assist as possible since I knew everytime I went up, I had to come down.

Will report return trip next week.