I've tested and found that ACC on highway does change the battery charging profile. With ACC from speeds of 52-68 I've noticed that the car in normal will charge to 80%, switch to EV, and discharge back to 40%. It will even hold EV beyond the blue section of the power band. It's a very repetitive cycle that yields better gas mileage than the standard, ev engagement system, during my testing, I've noticed at least a 3mpg higher average with ACC versus manual speed control.Can you talk about that more? My gut tells me that adaptive cruise control, just like cruise control, is focusing on MPH instead of MPG.
I like to use Sport when I'm merging onto the freeway, EV when I'm on a straightaway in traffic (no temptation to accelerate), and Eco everywhere else. I did try my daily commute in both Eco and normal. 48 MPG normal, 52 MPG Eco. My commute is 30 miles one way and very hilly.
Generally I use ECO for 45 mph or slower, roads.
Normal for 55+ highway.
Sport is only used situationally, either for forced battery charging, or when I need the Powa!!!